changed the rear springs in a 1979 hurst olds, 1980 442, 1985 442, and a 1985 salon just this summer.........all are NOT bolted in. the mounting rings you speak of in the monte are already welded/bolted to the car/frame/rear end.
springs simply held in by the shocks and the weight of the car
peace
springs simply held in by the shocks and the weight of the car
peace