This Kyosho factory replacement caster setting upper arm set is designed for the MR-04 platform. The set includes multiple upper arms with integrated caster adjustment geometry, allowing tuning of front end handling characteristics. Each arm features a ball end fitting and clips into the chassis via slotted mounting tabs. Features: Includes multiple upper arms for caster adjustment tuning Designed for Kyosho MR-04 platform Integrated ball end fittings on each arm Slotted mounting tabs for secure chassis attachment 7/7/26 cs