ok, so i need some 3/8 coarse grade 5 or better bolts with a 1 or 1.25" shank with a flanged head which has a shoulder dia. of no more than 1/2". no one in portland seems to carry this type of bolt, which happens to be what is required for my pressure plate on my rig. the instructions which came w/ the pressure plate say i can't use a washer and a bolt - it must be a flanged head. why is this? any tips on where i can pick up the proper bolts?