Utilization of Blue Ox baseplates with any tow bar not approved by Automatic Equipment Mfg. Company invalidates the limited warranty. Installation of this baseplate requires drilling holes in the cross member of the vehicle's frame. 1. Read the General Instruction Sheet included with this baseplate. 2. The baseplate mounts to the van using six bolts, all of which are provided with the baseplate package. 3. Notice that there are four 7/16" holes spaced across the bottom of the metal bumper and that each one has a square hole next to it. The baseplate uses the two center holes