Many European-made cars use wheel bolts with threaded rods attached to conical/ball seats that match the wheel inserts to fasten the wheels. If you plan to install new aftermarket wheels, then check the lug seat of the wheels is necessary. Common seat types of wheel bolts include conical seat, ball seat, flat seat, etc. You can get information from the wheel manufacturers or ask professionals for help. It is essential that the wheel bolts seat and the wheel lug seat match. Otherwise, when your vehicle is loaded to capacity, an emergency maneuver performed at high speed may lead to a bolt failure.