Help finding resto parts!!

[100mph]

Hey everyone, just picked up a '69 C/10 SWB and need a little help finding good quality parts and vendors.

Its about 1/2 way there but needs odds and ends in parts - mirrors, emblems, heater control assembly, door handles, door locks, armrests, seatbelts... you get the idea.

I've checked out the vendors on this site but not many seem to have full online catalogs so for now I'm pricing around on the following sites:

LMC Truck
Classic parts of America
Brothers

But I'm finding quite a bit of price difference - for example the heater control assembly ranges from $89 to $129 for at least what appears in the catalogs to be the same (I think).

I'm thinking, how many companies could possibly be making 67 to 72 chevy heater control assemblies and that they probably are all the same but am I wrong???

And what about things like door handles, locks etc - is there a big difference in quality?

So I'm looking for advice from what is likely your many more years of experience in part hunting.... any assistance is more than welcome.

Thank you

Mike