Disc question

BillGrissom said

Just to clarify, OP mentioned "control arms" above. Only the upper control arm varied. The lower control arm was the same for disk or drum, and I recall for all years 1963-76. Except some lower control arms have a bracket to attach a sway-bar link (optional) and I recall that bracket varied between early-A and 1973+ A, probably because the later have a wider engine bay (+1"?).

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Just to add to your post Bill, '62 A-bodies used the same lower control arm too. Also, there are actually 3 versions of the sway bar type. The '65-6, the '67-72, and the 73-6. The '65-6 will interchange with the '67-72, they just have a slight appearance difference with an extra built-in washer on the lower part of the "eye" where the strut links attach. For the purist, there are also appearance differences in the later years too. The welded-in plate for the bumper changed over the years. Some went full width across, and others were a bit narrower. To save a few cents cost and a tiny bit of weight I suppose?