RECOMMENDED MOUNTING INSTRUCTIONS For Light Series 400X **Proper instrumentation this product is the sole responsibility of the installer™ . Locate on vehicle and position light parallel to the ground. . In the interior of the vehicle, loosen upholstery at mounting location. . Use available to start three (3) mounting holes and one (1) wire hole See diagram below, Drill the three holes out using a. 174" drill bit, and the wire hole with.a 3/8" bit. . {insert wire through 378" hole‘and.