Rugged Ridge Solid Motor mounts are built from 6061-T6 Aluminum with a tensile strength of 42,000 psi. Built to replace your wimpy OE rubber engine mounts to eliminate weight transfer on the trail torque loss and binding that result in excess engine movement. Our mount features a protective black anodized finish for long life and corrosion resistance.. This pair of 6061-T6 aluminum solid engine mounts from Rugged Ridge fit 74-91 Jeep SJ models with an AMC V8 engine.