What size threads on bed bolts?

[Hardline]

I have a 95 F350 CC and I am about to buy a dually bed for the truck. I sold the bed I took off of it a couple years ago when I installed the utility bed. Now the truck has been retired and needs a stock bed installed. The used bed I am buying still has all of the bolts hanging down. I just forgot to look to see what size they are. I want to bring a couple nuts with me when I go to pick it up so that I can install them for the ride home and not have to worry about the bed falling off. Thanks JJ