Focused composite shock bodies with threaded spring spacers engineered to serve as direct replacements for rear big‑bore shocks on 1/10 scale 4x4 BLX 4S RC vehicles. These components restore the structural support and sliding surfaces inside the shock assembly, helping maintain consistent damping and suspension travel under repeated off‑road loads. Precision‑molded threads on bodies and spacers facilitate accurate preload settings and serviceability.