after a few minutes looking in my wagner master catalog, it seems the dodge monaco and polara [C-body] used 11x2 rear brakes as standard equipment from 66 to 76, unless it was a station wagon or had the towing [hd] package, then those got 11x2 1/2" brakes in the rear.
then, the 77 and 78 model years of these got the more common 11x2 1/2 brakes.
if looking for brake parts for your 11x2 brakes, you could start there.