Difference between disk brake and drum brake lwr ball joints ?

Its the distance between the 2 holes, and I believe hole diameter. Theres a kit out there for drum brakes and small bolt pattern hubs. It uses redrilled Toyota Previa minivan rotors, and mid 1980s Chevy Celebrity X car front rotors. Those same rotors and calipers may be available locally since both GM and Toyota manufactured this stuff in large numbers all over the world. May be a GM offering in OZ that used this caliper. The scarebird kits have brackets for 65-72 A with 9" drums, and kits with 10" drums. Not sure if there is a difference on the spindles between those drum sizes, since I always pitch that stuff in the scrap trailer, and use 84-89 M body big bolt pattern disc brakes.

Look up A body Kits for drum spindles from www.scarebird.com you can buy the bracket kits pretty cheaply and source your own stuff locally, or try Www.rockauto.com for the other needed parts wholesale online