TheThule ClipOn 9103 is easy to mount to the rear door with a unique snap-on system. All parts in contact with your vehicle and bikes are coated with rubber for extra protection. It is compatablie with the Thule Light Board 976 and for the fitting of non-standard bike frames, use Thule Bike Adapter 982. This product does not have universal fit and comes in two versions (9103 and 9104), having different tube diameters fitting different vehicle models.