- This product is a control arm kit for BMW 3 Series G28. It includes 14 items, such as ball head sling arm, control arm, cross tie bar, and bushing. The kit is designed to be placed below, lower, left, right, or above the vehicle. The manufacturer provides a 6-month warranty. The kit is compatible with OE/OEM and interchange part numbers 31106878593, 31106878071, 31106878594, 31106878072, 31106894671, and 3110.