JR-M502-LB is an aluminium rear suspension arm made for the Tamiya M-05, M-06 and MF-01X chassis as a direct-fit alternative to stock plastic arms. It is intended to reduce flex and extend service life while keeping the original mounting interfaces.
Confirm the arm matches your chassis mounting points before fitting. Installation follows the same steps as replacing a stock arm: remove the old arm, check hinge-pin and pivot fit, refit using existing hardware, then verify rear toe and camber to preserve handling balance.
In use the aluminium arm changes dynamic rear response by limiting flex; this can make the car feel firmer and may require small setup adjustments. The light blue finish is cosmetic and does not alter fitment dimensions.