I sold the RD to Mick as is and brought a Yamaha XJ650 an 81 SECA model not the Maxim. It needs a few things for RWC and a lot of TLC. I have managed to track an XJ900 down for parts. The XJ900 runs okay but is missing 2nd gear.

Things I know I need to swap of the 900 (if any good) or replace to get a RWC
Indicator lens
Mirrors
Seat
Front Brake System
Rear Shoes or swap XJ900 disc rear end on to it
Electronic Flasher Can
Tail light globe
Tacho light