I've replaced a couple of rivets on my frame, and have running board brackets and shock mounts to put back on as well. The method I use was to put the rivet in place, heat it cherry red with an O/A torch, then use an air hammer with a riveting attachment to peen the shank over and form a head. The back was bucked with a piece of 1-1/2" dia steel with a recess in it to match the rivet head. One rivet that had sheared off on a cab mount bracket needed a larger rivet, so I fabricated one from a bolt, grinding the hex head to a domed profile typical of the existing rivet heads. For the others, I bought a batch of rivets of the proper size. Got them online. Hanson Rivet is a good source for all kinds of rivets, including tubular ones for sheet metal parts.
