Hooker BlackHeart Clamshell Engine Mounts and Polyurethane Engine Mount Inserts are now available for GM LS and Gen 5 LT engines. These clamshell housings are a two piece bolt together design featuring heavy-duty 11 gauge steel construction with a durable powder coated finish. Hooker BlackHeart Polyurethane Engine Mount Inserts have been designed with durability, performance, and ease of installation in mind. The inserts are available in both black and red, and feature factory style indexing tabs to help with alignment during installation.