Correct bolts for seat track to body

[ClassicSnap]

Afternoon all.

Car: 67 Barracuda Notchback
Bolts I'm looking for are the ones that bolt the seat frame to the body (Front bench) - size and length
Any help appreciated

Thanks

 

[whitepunkonnitro]

Those are studs that stick through the floor. 5/16s coarse thread. Nuts have special washers attached.
I have those if you need them

 

[ClassicSnap]

I stand corrected in that they are studs. How much for nuts?

Thanks