Marty...I did not know that ACE was the place for SS bolts. Good catch i will give them a look-see.
Denny is correct the back fender on our truck was painted black primer that is what is under the top coat.
My 86 year old uncle also agrees with Denny as to NO welting on the back fenders as it was unnecessary due to the flat mating surfaces...another mystery solved!
Keep on wrenching, stay safe and thanks Steve