I've never had a fender or a body off a Henry J. According to the Henry J parts book, there are 28 bolts that fasten the rear fenders - 18 of one size and 10 of the other. Based on this, I would conclude that it breaks down to 14 bolts/screws on each rear quarter. Regarding body bolts, according to the Henry J parts list, there are 14 bolts that fasten the body to the frame. A good site to visit is this one
http://www.henryjcars.com/hjc1p1/hjcp1index.htmlThis site walks you through everything Mike did on one of the most ambitious and complete Henry J restos I've seen.
You can't help but be impressed.
Regarding wire harnesses - Bob McBride in Florida makes them to order. You have to send him the 5 sockets that snap into the cluster so he can use them on the on new one. He needs to know what year and which engine (4 or 6) and he'll take it from there. Contact Bob at 1-772-466-3510
He does a great job on them.