I spent some time poring over the reference imagery available and trying to identify some of the badges and emblems on Joe’s codpiece, and I think I nailed some of it down. Funny enough, eBay Motors was actually key to identifying some of these.
The “49” badge I have no idea on, but it was easy enough to model up based on the references available. The codpiece castle nuts were pretty straightforward to model up, and will certainly be lighter than the actual parts – using real metal hardware would mean this codpiece would weigh far too much to be practical.