question about gas tank

[GreenMystChevy]

I am looking for a gas tank to put under the bed of my '72 4x4 chevy truck. Mudder67 has a 31 gallon tank from an 85 or 86 blazer non fuel-injected under his pickup.

Long story short, what years did these 31 gallon tanks come on and did all blazers of these years have them or were they a special option? I am looking to get rid of the tank in my cab and put a larger tank under the bed and this is the best one I can find with the correct dimensions.

Also, anyone know where I can get one for fairly cheap?
I also posted this in the blazer section but that looked pretty desolate compared to here so I figured I would have a better shot over here. Thanks for all the help guys!

[Captkaos]

31 gallon tanks were optional on Blazers. Standard was the 31. Burbs are more likely to have the larger 31 gal tank, but still you would have to verify it. They were availible on all Blazer/Burbs from 73-86 for non EFI versions. I can get you the tank brand new through 73-87chevytrucks.com, just PM me.

[bigblock73]

Originally posted by Captkaos
31 gallon tanks were optional on Blazers. Standard was the 31.

Chris, have you been playing too much PS2?

[Captkaos]

No, my weekend was turned upside down (I will call you tomorrow) and I was in a hurry posting to go to my parents (where I am now) and wasn't typing what I was thinking.

That should be 28 gal was standard.