Rear Disc on 74 Duster 8.25

I'm doing that swap on a 74 A 8.25. The only parts I'm reusing is the caliper bracket and dust shield. I bought new calipers, hoses, rotors, e-brake shoes and e brake hardware. The center hole on the adapter and dust shield needs to enlarged with a dremel or die grinder to fit the early housing. I've got one side done and am working on the other side. I'm also going from a 2.71 peg leg to a 3.55 SG so new bearings, etc for that swap. Hope this helps