This polyurethane rear bushing kit will fit all BMW E30 models except the xi. The kit includes: 1x differential bushing 2x subframe bushings with new top washers 4x trailing arm bushings Revshift bushing lube Lifetime warranty * The 12mm riser bushings include differential studs and spacers for an additional $25. The diff spacers are necessary when raising the subframe. Hardness80A Street (Black): Slightly stiffer and stronger than OEM rubber. No increase in NVH. Great choice as an upgraded stock replacement (OEM+).95A Track (Green): Significantly stiffer and stronger than OEM rubber. Noticeable increase in NVH. Excellent for enthusiastically driven street and track cars.75D Drift (Teal): Drastically stiffer and stronger than OEM rubber. Moderate increase in NVH. Most commonly used on dedicated drift and track cars.(NVH = noise, vibration, harmonics)Learn more about choosing polyurethane here: https://revshift.com/pages/polyurethane Please specify the hardness and subframe bushing height
