On the ones I have done I used the unit 10-1515 from NAPA. It's a rebuilt, I don't know the number of the NEW unit. I just had them look up for a 71 Cuda with manual disc brakes and this is the number.

'09 Challenger R/T '70 Challenger T/A 340 6Pak and Auto I was born with nothing and I still have most of it left!