Powerflex Polyurethane Bush kit for BMW E36 3 Series (1990 - 1998) Rear Diff Front Mounting Bush - PFR5-325BLK - This part replaces OE number: 33171134871. Use PFR5-325 for all models where the bush is in the subframe - M3 models upto 1996. PFR5-324 fits later M3 Evo models where the bush fits into a separate mounting bracket.here the bush fits into a separate mounting bracket. - Bush Size: - PRICE IS PER CAR KIT, NOT per bush. Powerflex usually price their bushes singly, but we have combined the QTY and price to keep it simple for you!