The only thing unique about the hooks is they are bent 90 degrees from the hook to the hang.This is a good idea because it keeps you from hooking anything as you pull the meat out. No big deal. I will be getting my hook stock from lowes or HD where they have mild steel rods there.
I had to make more than the 8 that came with it because it is my suspicion I can do 14 racks of ribs in my UDS when I mod it to hang three segments of rebar; one in center tow each side. I would assume the center post could hang 6 with the other two on each side could hold 4 each.
I think PBC sells hooks though for 8.95 a set shipped. Might be worth it just to buy it.