This SWORKz replacement rear lower arm holder is machined from aluminum and designed for the S12-3 1/10 2WD buggy platform. The RF designation indicates this is the right-front position of the rear lower arm mount. It serves as a direct factory replacement for the original part, offering the same fit and function for suspension geometry maintenance or repair. Features: Aluminum construction Rear lower arm holder, RF position Designed for the SWORKz S12-3 platform 7/7/26 cs