Powerflex Black Series Car: BMW - E81, E82, E87 & E88 (2004-2013) description: Rear Subframe Rear Mounting Insert purchased parts package: 2 installation location: rear notice: PFR5-421BLK is an Insert to be used with the OE rubber bush. For a full replacement bush use PFR5-422BLK Diagram reference: 20 Part no.: PFR5-421BLK