PowerFlex PFF85-431 Polyurethane Front Strut Top Mount Bushings 10mm Lowering Powerflex Street Performance polyurethane replacement 10mm lowering front strut mount bushings. The 10mm Lowering part replaces 1J0412331C and has been designed to give an extra 10mm of lowering when fitted as it allows the strut to sit higher into the body of the top mount. These new top mounts ship complete with new top cap spacers, made using Powerflex Black material. Number 11 in the diagram. Set of 2 bushings. All Powerflex products come with Manufacturer's Lifetime Warranty Bonus: Powerflex copper-based grease is supplied with every bushing set