I don't know about buicks, but I think a- bodies had a 69 only setup. Other years will work. My pontiac has 2 piece rotors and one year only dust shields. Calipers are the same afaik.
I have a set off a 69 GS. Rotors are junk. 69 had a hold off valve mounted on the brake booster as did 70 but they are different
Sounds like Denny has what you need. If not,I have everything except the factory original master cylinder. I have an original pair of 2-piece rotors,and the correct hold-off valve,along with the spindles,hose brackets,etc. I don’t know how or if the rotors are reusable though.
