PowerFlex PFF85-430BLK Polyurethane Front Strut Top Mount Bushings - Race Series Powerflex Race and Track Performance polyurethane replacement front strut mount bushings. Set of 2 bushings. Race Series Black. PFF85-430BLKX2 Number 11 in the diagram. All Powerflex products come with Manufacturer's Lifetime Warranty! Bonus: Powerflex copper-based grease is supplied with every bushing set!