all 62-70 spindles,uca/lca's interchange,,'66/'67B housings are narrower(54 1/4")flge.-flge. than '68-70,and are only a tad wider than A body dims,with the same perch distance,and alot of guy's bolt them right into dusters,.......'66/'67 axle is also the choice for early '62-65 B's,,,the disc brakes from '65 are junk,I don't like to recommend using the taller spindles from '75-81 B body's,because of all the arguments it causes,but we have been using them since the 80's on all the '62-70 B body's that we build,nobody put's a '65 back K frame in a '66 up B body,it's the other way around,we put '68/69 K's into early B's for the engine setback,and new style mounts,adaptable swaybar,oil pan clearance,etc.....