These mounts allow the installation of any GM LSx family engine into the e28 series chassis. These mounts are made to requite the 04-06 GTO oil pan and a T56 (98-02 fbody, gto will also work) transmission. These mounts use the e28 535 stock engine mounts. They are also made to clear a vacuum booster. Mounts are made to order and average time is 2-3 weeks.