2123200825 Mercedes Benz E Class W212 Air Bag Suspension Rear Air Spring Repair Bag Our rear air spring repair bellow 2123200825 is a reliable aftermarket replacement component engineered for the original air suspension system of Mercedes-Benz E-Class W212 chassis. After long-term operation, the factory rear air springs on Mercedes W212 commonly suffer from rubber aging, cracking and gradual air leakage. These failures lead to rear-end sagging, uneven ride height, reduced