For anything larger than 18" you are gonna need a bling-bling shop that caters to customizing Lincoln Navigators and installs cardiac-unfriendly stereos. There are several between you and Richmond. Not exactly something that can be done on a lunch hour. You will prob have to drop it off and pick it up in a half-day. Are the wheels mounted on the car already or is this a spare set? The shops will also want to know the width of the wheel. If you purchase tires from them, mounting is usally free, balancing sometimes, too.