Bill : I just looked at the 1967 Only, the 1960-68 and the 1965-72 MPC's, and I believe the confusion is in the interpretation of what is presented in each. In all three, as you noted, it gives no differentiation of M/S or P/S for the Upper Bushing. However, for the Lower Bushing, all three MPC's note separate Part Numbers for "M/S" and for "P/S". Other applications for other Models noted in the MPC's are treated in the same manner. Thus, when no distinction for M/S or P/S is noted, one must conclude that the Part shown is applicable to both.
Make sense ?
Bob