Trying to button things up and I have apparently lost the the 4 mounting bolts for the fan shroud on my 72 duster with AC. I took the u nut to a few stores came up with a thread size of 8-32 but I can not find any bolt the will work, any ideas where I can get these?

try hardware stores in the electrical section, they are the same screws that hold box covers on octagon, 4x4 or 4 11/16 square boxes, they will be machine screws, not bolts if this is the route you go

I have found them in the nut and bolt section of stores like Home Depot.

Thanks for the help! Stupid little things were driving me crazy!