I don't think that you do. I'm pretty sure that all of the hardware is the same except for the rear pressure reducing valves. I do know that the pressure reducing valves are different for ABS compared to non ABS. I also know that when the recall was done on replacing the rear pressure reducing valves that the drum brake cars used the same valve part number as the disc brake cars. The ABS cars were not involved with the recall and do have a different part number.
If anyone else has additional insight, please jump in here.
