Sorry to bother you,but I’m tired of buying the wrong size bolts. I’m trying to put new screws in the plenum cover on my 302 in my 1953 F-100. I would like to put them back if possible in polished stainless. I’ve seen where these bolts are 8-32 x 1/2 but are they fine thread,course thread or other? Any help you could send my way would be appreciated.