Many of today's car wheels have press nuts. If so, you'll need a special tool like this to attach them. You can't change a tire on this type of wheel with a regular car hanger, but it will (probably) fit on this extra long seat. Please make sure the size fits your car before ordering. Each bushing has 6 internal slots (combs) for installing a hex nut. The diameter is crucial. They only fit 3/4" (19mm) or 13/16" (21mm) nuts. Check out the user manual!