Longer 5/16 body bolts?

Looking for 1 3/4 or 2" bolts.
Don´t thing these come any longer than 1 1/4" but are their any longer, with the same type head? Captured washer can be faked and marking not that important either.
Dog point can be fixed too.
So longer bolts with this particular head is what I´m looking for.
Is for my front seats to floor fastening.
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General Motors used the 5/16 - 18 coarse SAE with captured washer also for seat feet retention. I have a LOT of hardware in cans. PM - maybe? might have something.