SBT high quality motor mounts are designed for performance in the worst conditions - under the hot, oily engine. Replacing your old PWC engine mounts with SBT motor mounts is a good way to reduce excessive vibration and movement that can slowly degrade the rest of your driveline, bearings, and jet pump. Replace any motor mounts that don’t appear normal to save the rest of your driveline!! If you have to replace one, it's probably time to replace them all.