Promod motor mount plate bolts & nuts

[iatemeself]

Hey i have a motor mount plate laying around, but i lost the flat head nuts and bolts that came with the kit, anyone know what size they are? :shrug:

 

[Oldsalt]

Most usually 5/16 X 1-3/4 were used by a number of early makers. Fine thread with flat washers on the slots and Nylock nuts. Of course there's no problem with 5/16 X 2 and National Course bolts.