Adjustable Caster Thrust Arm Bushings - Pair E8X/E9X



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The SPL FKS Front Caster Bushings replace the stock thrust arm bushings that often are soft, unresponsive, and become brittle over time, contributing to worsening suspension performance. SPL produces low friction articulating spherical bearings that completely eliminate deflection and reduce friction.  SPL uses 1" FK racing bearings with self lubricating Teflon liners to achieve the ultimate in performance and longevity. SPL's next level CNC'd offset bearing spacers allow for +/- 4 degrees of caster adjustment - in the event that you have modified suspension, this caster adjustment allows you to dial in your suspension geometry and lower your lap times. Achieving optimal suspension geometry under load greatly enhances both braking and handling feedback.

SPL Parts are designed and manufactured entirely in the USA. All materials are sourced from American suppliers to ensure that only properly certified materials are used to manufacture SPL Parts. Chromoly seamless straight tubing DOM mandrel bent tubing, 6061 and 2024 aluminum are used in SPL Parts to give their products unparalleled strength and quality. Products are TIG Welded by local professional welders, all CNC machining is done by local machine shops to meet tolerance specifications, and all research & development is done in-house. From racing to street car applications, SPL Parts are extremely high quality, durable, suspension products that are sure to get your vehicle back in spec.


  • 6061 Aluminum bearing housing w/ outer knurl
  • 6061 Aluminum offset spacers allow for +/-4 degrees of caster adjustment
  • FK 1" Spherical bearings

Made in the USA!

*NOTE: Sold in pairs - does not include thrust arm. See install PDF for instructions.