I looked it up for my caddy as well, they can fit if you get a lift on the car itself. The biggest recommended size is 20s with a decent size tire, going low profile wouldn't last long because of the car's weight.
Asked in Cadillac DeVille
Will the front window shield of a 1996 Cadillac Deville fit on a 1998 Cadillac Deville?
as long as they both do not have Heated windshield yes it will fit. from 1994-1999 ...