Ball joint adapters

RedFish said

I dont know what "across the board" implies. Do e, b, c, f,m,j, all use this same upper ball joint ? They continued to use the smaller a-body ball joint, employing both large and small for several years after they determined a larger joint was required in certain applications.

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It was a cost cutting effort by Chrysler. 73 up A bodies also only had one lower ball joint part number instead of three for 72 back. Same deal, cost cutting.
73 up A bodies, 62 up B bodies and the E, F, M, J bodies all used the same thread in upper ball joint. Same part number for all of them.
C's used a larger piece.
Not sure what you mean by "they continued to use the smaller a-body ball joint...". Its use ended after 1972.