PMC Motorsport - Solid aluminium subframe bushes BMW E30PMC Motorsport Aluminum Rear Subframe Bushings (Bearings) BMW E30 Aluminum bushings for press fitting into the rear subframe instead of the original metal rubber bushings. They significantly stiffen the suspension and prevent the "floating" feeling of the car's rear end. They perform exceptionally well in cars used for drifting, KJS, supersprint, GSMP, as well as in production (stock) cars. Our entire production and R&D design department are located