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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How many do u need ? four or eight ? I might have what ur wanting >???