These motor mounts will help to keep the engine/transmission on the same plane as the shifter regardless of how much they are trying to twist themselves out of your car. This will minimize some of the vagueness in shifting under heavy acceleration. The solid mounts also tie the whole engine/transmission firmly into the back of the car, greatly stiffening the whole rear of the chassis. Crafted in aircraft grade 6061 T6 Aluminum and anodized black. Replaces 65-89 Porsche 911 motor mount & 72-89 911 transmission mount. Sold per pair.