67-72 Suburban OE seats

[srfinatsunset]

Hey guys
My second row seat is not matching up to the holes that are in the support cross member. At one point the seat bolted up to an axillary gas tanks. Centered in the cab. Now I want to bolt the seat to the left side (offset so kids can get in the 3rd row) There are two sets of hole in the cross member. Straight stamp holes and holes with a weld nut. Welded nut holes put the seat center of the cab. How do I get my seat off set.

[HO455]

Uh

Originally Posted by srfinatsunset

Hey guys
My second row seat is not matching up to the holes that are in the support cross member. At one point the seat bolted up to an axillary gas tanks. Centered in the cab. Now I want to bolt the seat to the left side (offset so kids can get in the 3rd row) There are two sets of hole in the cross member. Straight stamp holes and holes with a weld nut. Welded nut holes put the seat center of the cab. How do I get my seat off set.

It's hard to tell which 2nd row seat you have from the photos. They came in two sizes.

Was your Burban a three row truck from the factory? It should be indicated on the SPID. The welded nuts on the crossmember reflect what seat layout the truck was ordered with. As far as I know GM didn't install crossmembers with weld nuts for both seat configurations.

Does your 3rd row seat have the factory style crossmember?

I believe the under seat aux tank was a dealer installed item only. So there would be variations in how they were installed. That being said I don't believe anyone has ever documented how those tanks were installed.

[srfinatsunset]

So both my rear seats are 50” seats. I looked SPID and it just says rear seat option. But if the weld nuts are factory placement then it goes in the middle. The rear plywood is not drilled for the 3rd seat. The rear seat I have also had 70-72 upholstery. Maybe they were swap out at the dealer when the gas tank went in???

Originally Posted by HO455

Uh

It's hard to tell which 2nd row seat you have from the photos. They came in two sizes.

Was your Burban a three row truck from the factory? It should be indicated on the SPID. The welded nuts on the crossmember reflect what seat layout the truck was ordered with. As far as I know GM didn't install crossmembers with weld nuts for both seat configurations.

Does your 3rd row seat have the factory style crossmember?

I believe the under seat aux tank was a dealer installed item only. So there would be variations in how they were installed. That being said I don't believe anyone has ever documented how those tanks were installed.

[HO455]

It looks like your SPID shows the 2 row seat code A53 and not the A80 3 row code.

It's likely that as you said the seat was swapped.

Does the underside side of the seat look factory compared with other short seats posted in this thread? It may be that they also modified the mounts to fit over the tank.

It may be worth posting a new thread asking if anyone has an under seat tank installed in a factory three row truck and how much room is allowed for access to the 3rd row. Maybe folks could provide measurements to compare.

I looked at this truck last year and I remember it was a factory 3 row with the under seat tank. The picture sort of shows how much access is available.