Original doors? Original fenders? How to tell? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**SoCoC10** · 06-19-2025, 10:09 PM

These pictures are of a 1970 K10 short bed fleet side. Trying to confirm the sheetmetal is original. Here’s pictures of the drivers door.

Front bottom corner.
Bottom of door.
Rear bottom corner.
The number “50” about 1/2 way up the rear window frame.

**SoCoC10** · 06-19-2025, 10:13 PM

Pictures of the passenger door.

Front bottom corner.
Rear bottom corner.
The number “10” about 1/2 way up the rear of the window frame.

franken · 06-20-2025, 04:28 AM

What do 07' and 71' mean?
7 feet and 71 feet, which is what the ' bits mean. You can look into contractions, which say when you remove characters you use an apostrophe.

Aftermarket parts have looser bends BTW.

**Orefactory4x4 swb** · 06-20-2025, 12:54 PM

I’m no expert, but they look original to me, and not aftermarket. But I see ,unless you get a one owner that really knows. It’s up in the air over the yrs. Both my 72 Cheyenne swb black k10 and hugger orange 402 c20 custom are.

**A1971Blazer** · 06-20-2025, 12:59 PM

May or may not be correct but I've heard tell that the outer front edge of factory door is turned in slightly where it meets the fender,
and the aftermarket ones are straight.
I can confirm that the aftermarket doors I bought were indeed straight on the front edge.

**Orefactory4x4 swb** · 06-20-2025, 01:20 PM

Quote:

Originally Posted by A1971Blazer

May or may not be correct but I've heard tell that the outer front edge of factory door is turned in slightly where it meets the fender,
and the aftermarket ones are straight.
I can confirm that the aftermarket doors I bought were indeed straight on the front edge.

If I remember right, that little bend had something to do with keeping them from rubbing there.

Casper42 · 06-20-2025, 10:15 PM

Quote:

Originally Posted by 70STOVEBOLT

Pointing out others' flaws will make you feel better I guess. I see it a lot with this member...

do you mean just like you pointing out the others' flaws in their comment, instead of giving an opinion about the topic? ....hum

@SoCoC10 - Those do look OEM to me. Mine has the same or similar

**Thealien** · 06-21-2025, 10:50 AM

I do not believe any of the aftermarket doors have the triangle embossed into those corners. So I believe those are GM doors but not sure if they are correct for the year.

**Rust_never_sleeps** · 06-21-2025, 03:08 PM

Quote:

Originally Posted by 70STOVEBOLT

Pointing out others' flaws will make you feel better I guess. I see it a lot with this member...

Some members are more impressive than others, which is why there’s an ignore list
….of course you may never see this, because I may be on your ignore list ;-)

weq92f · 06-21-2025, 06:56 PM

.

I remember a past thread about how to identify original fenders where the consensus seemed to be if your front fenders have 3 little triangles in the nose curve on the inside where the grill bolts to the fender, it's OEM.

Found this thread but don't think it's the one I was remembering but it too mentions this:

https://67-72chevytrucks.com/vboard/...d.php?t=450407

And this thread seems to confirm it:

https://67-72chevytrucks.com/vboard/...d.php?t=595514

FYI, my '67 has one OEM and one aftermarket based on this triangle thing.

Hth,

-Kevin

**zicc1835** · 06-21-2025, 07:59 PM

interesting info

72c20customcamper · 06-21-2025, 08:36 PM

Quote:

Originally Posted by weq92f

.

I remember a past thread about how to identify original fenders where the consensus seemed to be if your front fenders have 3 little triangles in the nose curve on the inside where the grill bolts to the fender, it's OEM.

Found this thread but don't think it's the one I was remembering but it too mentions this:

https://67-72chevytrucks.com/vboard/...d.php?t=450407

And this thread seems to confirm it:

https://67-72chevytrucks.com/vboard/...d.php?t=595514

FYI, my '67 has one OEM and one aftermarket based on this triangle thing.

Hth,

-Kevin

Yes the triangles are sure sign they are OEM but after 68 they must have gotten a different vendor or better die machines . You won’t see any triangles on 69 and up trucks also most aftermarket doors won’t have that pie shaped raised area in the corner.

**DaHos** · 06-22-2025, 09:30 AM

Newer tooling GOOD reproduction doors do have the "PIE" in the front corner.....MOST older tooling do NOT (TriPlus)

My $ is they are OEM based on the info/pics provided.

**SoCoC10** · 06-24-2025, 10:46 PM

Thanks for the input

06-19-2025, 10:09 PM	#1
SoCoC10 Senior Member Join Date: Nov 2014 Location: Colorado Posts: 3,401	Original doors? Original fenders? How to tell? These pictures are of a 1970 K10 short bed fleet side. Trying to confirm the sheetmetal is original. Here’s pictures of the drivers door. Front bottom corner. Bottom of door. Rear bottom corner. The number “50” about 1/2 way up the rear window frame. Attached Images __________________ 07' Extcab Silverado Z71 Silver Birch, 5.3L HO 71' Cheyenne C10 Hugger Orange on Saddle SWB Besides these two, too Many to count

06-19-2025, 10:13 PM	#2
SoCoC10 Senior Member Join Date: Nov 2014 Location: Colorado Posts: 3,401	Re: Original doors? Original fenders? How to tell? Pictures of the passenger door. Front bottom corner. Rear bottom corner. The number “10” about 1/2 way up the rear of the window frame. Attached Images __________________ 07' Extcab Silverado Z71 Silver Birch, 5.3L HO 71' Cheyenne C10 Hugger Orange on Saddle SWB Besides these two, too Many to count

06-20-2025, 04:28 AM	#3
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,364	Re: Original doors? Original fenders? How to tell? What do 07' and 71' mean? 7 feet and 71 feet, which is what the ' bits mean. You can look into contractions, which say when you remove characters you use an apostrophe. Aftermarket parts have looser bends BTW. Last edited by franken; 06-20-2025 at 04:38 AM.

06-20-2025, 12:54 PM	#4
Orefactory4x4 swb Senior Member Join Date: Mar 2023 Location: Springfield oregon Posts: 385	Re: Original doors? Original fenders? How to tell? I’m no expert, but they look original to me, and not aftermarket. But I see ,unless you get a one owner that really knows. It’s up in the air over the yrs. Both my 72 Cheyenne swb black k10 and hugger orange 402 c20 custom are.

06-20-2025, 12:59 PM	#5
A1971Blazer Senior Member Join Date: Nov 2013 Location: East Tennessee Posts: 2,408	Re: Original doors? Original fenders? How to tell? May or may not be correct but I've heard tell that the outer front edge of factory door is turned in slightly where it meets the fender, and the aftermarket ones are straight. I can confirm that the aftermarket doors I bought were indeed straight on the front edge. __________________ 1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer .............

06-21-2025, 10:50 AM	#8
Thealien Senior Member Join Date: Jun 2007 Location: Pine Ridge Florida Posts: 4,188	Re: Original doors? Original fenders? How to tell? I do not believe any of the aftermarket doors have the triangle embossed into those corners. So I believe those are GM doors but not sure if they are correct for the year. __________________ Click on my Not really a build thread, yet NOT SO RUST FREE RUST FREE BLAZER LS ENGINE SWAP INFORMATION THREAD BOLT RESTORATIONS 4l60 to an NP205

06-21-2025, 06:56 PM	#10
weq92f Registered User Join Date: Oct 2016 Location: Dallas Texas Posts: 3,850	Re: Original doors? Original fenders? How to tell? . I remember a past thread about how to identify original fenders where the consensus seemed to be if your front fenders have 3 little triangles in the nose curve on the inside where the grill bolts to the fender, it's OEM. Found this thread but don't think it's the one I was remembering but it too mentions this: https://67-72chevytrucks.com/vboard/...d.php?t=450407 And this thread seems to confirm it: https://67-72chevytrucks.com/vboard/...d.php?t=595514 FYI, my '67 has one OEM and one aftermarket based on this triangle thing. Hth, -Kevin __________________ 67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold

06-21-2025, 07:59 PM	#11
zicc1835 Senior Member Join Date: Mar 2011 Location: Hanover NJ Posts: 4,842	Re: Original doors? Original fenders? How to tell? interesting info __________________ Grand Theft Auto https://67-72chevytrucks.com/vboard/...d.php?t=855961 Doc & Kim build http://67-72chevytrucks.com/vboard/s...d.php?t=722288 I am from the desert http://67-72chevytrucks.com/vboard/s...d.php?t=650332 basket case build SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=648557

06-22-2025, 09:30 AM	#13
DaHos Senior Member Join Date: Sep 2011 Location: Owosso, Michigan Posts: 2,867	Re: Original doors? Original fenders? How to tell? Newer tooling GOOD reproduction doors do have the "PIE" in the front corner.....MOST older tooling do NOT (TriPlus) My $ is they are OEM based on the info/pics provided. __________________ 1967 C10 SWB Owner - Rustbelt Restorations

06-24-2025, 10:46 PM	#14
SoCoC10 Senior Member Join Date: Nov 2014 Location: Colorado Posts: 3,401	Re: Original doors? Original fenders? How to tell? Thanks for the input __________________ 07' Extcab Silverado Z71 Silver Birch, 5.3L HO 71' Cheyenne C10 Hugger Orange on Saddle SWB Besides these two, too Many to count



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.