Most motor mounts only last 60,000 miles. So most cars today are running around with bad engine mounts. The easiest way to determine if you have a bad or failing motor mount is to step on and off the accelerator at say about 30 mph in 2nd gear. You should not hear any clunking or feel any movement in the drive train. The other indicator of a failing motor mount is you will feel vibration in the seat of the car as you accelerate and decelerate the vehicle. Most cars have a right and left motor mount, however if you own a front wheel drive car, you will have a right, left, and a front and rear engine mount. Remember when ordering a motormount, the right engine mount is to the right of the engine when you are sitting in the drivers eat of the car or truck! On those cars with a front and rear mount, the front engine mount will be the motor mount closest to the radiator. All of our engine mounts are of the highest quality, and most of them ore original equipment or genuine engine mounts.