How do you raise a 92' cadillac sedan deville from the rear end so your 20 inch rims dont rub the tire with the fender?

bra two ways, by new air shocks for rear w/ manual air inlet, and air up. or check your compressor make sure it works, your air lines dont leak, and shocks hold air and adjust your height sensor behind RR tire. or remove coil springs and put air bags in rear, like i did. ridin big on 22s patna