Axle spacers prevent your axles from extending beyond their limit under hard cornering or compressions. This can lead to unwanted noises, wear on the CV joints, and even to your differential flanges popping out. The spacers are 6mm thick and come with extended high grade bolts. The price is per set.168 version is suited for small case differentials, this includes:E30: 316i, 318i, 320i, 323iE36: 316i, 318i, 320iE46: 316i, 318i, 320iE9x: 316i, 318i, 320i, 323i188 version is suited for medium case differentials, this includes:E30: 325, M3E36: 323i, 325i, 328iE46: 323i, 325i, 328iE9x: 325i, 330i210 version (choose car) is suited for large case differentials, this includes:E36: M3 3.0 & 3.2E46: M3 See the last picture for the exact measurements.*Not suited for drifting purposes.