No idea to be honest. If it was me, I'd locate some brackets for a stock square body bench (since that what would fit in the truck originally and to the original holes) and then see how I could get those to fit on to this newer bench seat you have. That would be your best bet to avoid modifying you cab floor.
thanks man! this was the best advice for the seat swap!
so i took the brackets off the 82 gmc parts truck at my bros house. they were about 4" too long on the top of the rail that bolts to the seat
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i bolted the outer back ear to the stock hole on the newer seat
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heres a better shot of the rail, so i cut the front of the rail and im going to drill a new hole at the front, and one at the back for the inner ear
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ALL the factory holes in the cab matched up!! so an 82 seat bracket with 4" cut off the front will bolt right up!!
so heres the before and after the bracket swap, its 100x better! looks better, feels better, i dont have a wheel on my lap
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i still need to drill the 4 holes, but i tossed it in to see how it would look and how close it was to fitting. I really lucked out! besides cutting a little extra off the front, its pretty much a straight bolt on with 4 new holes drilled, 2 front holes threw the bracket and seat, and 2 in the back threw the seat. the truck has a whole new feel behind the wheel now. i like it!
