the 11x2 1/2" drum setup came on pickups, C-bodies, wagons and most [if not all] B-bodies with the trailer towing package.
8 3/4, 9 1/4, and dana rears will all interchange, from roughly 66 up to [at least] the 78-80 model year and perhaps farther, with the 4 1/2" bolt pattern.
the axle stand off is the same, so all you need is the backing plate, drums, and the associated hardware.
be aware you also need the e-brake actuating bar as well, as the bar for the 10" brakes is shorter.