Went back in my E-mails and here's what I found out.

67-68 used the MC 2225541. Had a 1" bore. Was used on both power and manual disc brakes. The MC lid had 70R3 stamping.

69-70 used MC 2229171 and 2229191 which was used on the Hemi cars. The lid had a stamping of J1703

It's my understanding that the 2229171 was used on all disc brake cars through 1975.

Also 70-71 Cuda/Challanger used 294444476 and 477.

Of course we all know the assembly workers used whatever part was available on a given day.