The rear track-bar controls lateral movement of the axle housing. When you setting your ride height, the fixed length of the OE track-bar will not fit height adjustments. This will results unnecessary stress on suspension and alignment problems. Hardrace adjustable rear track-bar allowing your suspension parts to work accuracy and set the alignment correctly and easily. . More direct energy transfer and feel . Constructed of high-strength steel alloys that offer durability . Manufactured to match OE fit . Offer you adjustability for setting up the suspension  Note: Harden Rubber Equipped 1 PCS/SET LIFT 0~4 INCHES  Fits: Mercedes-benz G-class W463 1990-2018