Ridex 919D0501 dust cover and bump stop kit for BMW X3 F25 and X4 F26, front axle. Complete protective kit including rubber dust covers (bellows) and polyurethane bump stops that shield the shock absorber piston rods from road debris, dirt, and moisture while also limiting suspension over-travel on heavy impacts. Direct OEM-equivalent replacement for BMW part numbers 31 33 6 787 104 and 6 787 104. Essential companion kit when replacing front shock absorbers. Supplied new in RIDEX quality.