Most auto shops use a lift system that has two arms on each side, where the entire vehicle is lifted over a sunken bay. In this instance, you'd need all 4 pieces. Upgrade: Click on the picture to buy the Jack Pad Kit with storage case! Rubber Jacking Point Jack Pad Adaptor for Mercedes Benz Jack up your car like the pros do. This tool is a must for all car enthusiasts. Safely jack up your car at any of the 4 factory jack points the way it was meant to be lifted. Fitment: Color: Black Dimensions: 68mm DIA X 42mm HIGH approx Material: Rubber Package includes: 1 piece/set Use Tips: For vehicles that are too low, in an emergency or in your local tire shop, it is often necessary to use the apex of the factory side. Notice: Please check the equipment below. It is not suitable for lever jacks. Please take appropriate safety precautions when working on your vehicle.