These polyurethane bushings will stiffen the rear subframe. They are available in "stock height" to retain the stock suspension geometry or "12mm" to raise the subframe to correct severe negative camber by roughly 4 degrees. Fits all BMW E30 models except the ix. New top washers and Revshift bushing lube included. Sold as a setLifetime warranty * The 12mm riser bushings include differential studs and spacers for an additional $35. 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
