The mounting shafts are different, but the LCA bushings are the same. You can theoretically swap a few parts around to fit a B arm in an A car or vice versa. The A arms ARE 1/2" longer from ball joint to the pivot shaft. It is possible to put A body arms in a 62-72 B car to get much more negative camber for circle track racing. The strut rod location is very close. The sway bar tabs closely resemble 70-72 B arms.