I was able to pick up some bare Nova disk spindles for my 67 bird. Donor cars seem to be getting harder to find in the Cincinnati area! I would like to find backing plates and caliper mounting brackets used. Would these parts off of a 70's camaro or GM big body work? I understand that the calipers are the calipers are the same for 69-81. What about boosters? Or am I limited to A and X bodies? Seems to be a lot more 2nd gen Camaros being parted out than the traditional donors. U-Pull lot also has a number of 70's big body cars. Did not see alternate donors addressed in the FAQ section.