I own a 98 Grand Marquis and im looking at aftermarket rims but i am not sure if they are compatible with my car. i know the rims are 5 lug 4.5 bolt pattern and are for rear wheel drive cars, they are 15x8 also. but they are 4.5" offset and "fit small bolt pattern ford mopar" and im not sure what that means. thanks.

 

your car has the 5x4.5 bolt pattern if the wheels have that bolt pattern they should fit the only thing you might need is a set of wheel spacers the thickness depends on how the wheels fit on the car.

 

depending on rim size, you could go with jeep wheels, mustang 5 lug wheels and stuff... think you need the 1 inch to 1.5 inch spacers to fit mustang wheels... ranger and explorer wheels fit too