[ImperialCrown]

This was a popular upgrade about 15-20 years ago. Many were grabbed from the salvage yards already. The factory has discontinued them.
Part #s to look for,
disc w/ABS:
4762684 (superseded to 5083788AA)-Rt
4762685-Lt

disc w/o ABS:
4762686-Rt
4762687-Lt

Use these part numbers as reference in your search. Rear hoses and m/cylinder are different between disc and drum. Remove the rear inline residual valves for the disc conversion.

 

[Jerry Simcik]

Thanks for the info! I already have all the ancillaries and have added ABS & TC via a PT Cruiser, but unfortunately the PT's backing plates, while using the same casting, use a different bolt circle to attach to the spindle.