This anodized red aluminum rear upper arm is an aftermarket tuning replacement for TAMIYA TL-01, GF-01 and WR-02 chassis. It installs at the original rear upper mounting points and is intended to improve the consistency of the suspension pivot rather than alter chassis geometry.
The arm reduces flex relative to common plastic parts and provides a firmer pivot surface under load, which can help drivers seeking a more direct rear response. Fitment assumes retention of the stock hardware and suspension tower layout.
Recommendation: check toe, camber and damper settings after replacement and make incremental tuning changes to regain your preferred balance. This product is for RC-scale use only and is not intended for any real vehicle application.