I got a new voltage regulator from E-bay (actually a '53 model) and a horn relay from a friend. I tried to keep the same wire routing scheme as the original. But I just couldn't resist using the plastic coil wrap instead of tape. The main firewall grommet, I got from Restoration World. The others I made by gluing pieces of rubber weather stripping together (with super glue) and cutting out the exact shape on a band saw. The firewall really needs to be airtight.