Longer 5/16 body bolts?

newmexguy said
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.

Ok, but do they have this typical "dog nose"? Or I can grind some off of a 1 3/4 or 2"?
Thank you.