THIS MOUNT IS DESIGNED TO REPLACE THE ORIGINAL FENDER MOUNTED BRACKET ON ALL 96-00 GMT400 VEHICLES AND ALLOWS SECURE MOUNTING OF YOU GEN 3 PCM. TO ATTACH BRACKET TO PCM SIMPLY REMOVE THE (4) TORX SCREWS ON THE UNDERSIDE OF THE PCM INSTALL BRACKET AND REINSTALL THE SCREWS. ATTACHES TO FACTORY FENDER AND ABS BRACKET MOUNTING POINTS.