SPL Parts FKS Series Front Caster Rod Bushings (CRB) replace the stock flexible rubber bushings with low friction, articulating Spherical Bearings eliminating bushing deflection and reducing friction. This maintains optimum suspension geometry under load to improve braking and handling feedback. Massive 1" sized FK Racing Bearings with self lubricating Teflon liners are used to ensure maximum performance and durability. Innovative CNC machined offset bearing spacers provide +/- 4 degrees of caster adjustment. Sold as a pair. Made in the USA. SPL Parts Caster Rod Bushings Features: 6061-T6 Aluminum bearing housing with outer knurl 6061-T6 Aluminum offset spacers provide +/-4 degrees of caster adjustment FK 1" spherical bearings Applications: 2006-2013 E9X 3 Series M and non M2008+ E8X 1 Series M and non M2014+ F80 M3 2014+ F82 and F83 M4 2016+ F87 M2