That is what I figured but since I haved never owned a RWD car(Import man only 19) I wasn't sure. Are all 4 RWD set rims the same offset like FWD. Also what is an allowable amount of offset for a ETC before the have the dreaded popping out roller skate look.
ON MOST cars, the rims ALL have the same offset. There are some exceptions to this rule but I'm not aware of any Cadillacs that have "specific" front and rear rims. As for at what point do they have that "popping out" look? That will depend heavily on the overall design and width of the rim. I don't think there's any rule of thumb kind of offset that produces that effect.
DO NOT PUT ON RWD RIMS you will stick out plus you jeopardise the wheel bearings/studs/and cv joints.rwd put all the weight on the mount surface instead of distributing to the whole wheel i have 16" fwd wires on my 90 deville they cost more but i love them