These Schumacher Racing Products machined spacers are a factory replacement for the Cat PB 4x4 buggy platform. Sold as a pair, they are precision-machined to 3.5x6.3x2.8mm dimensions for consistent fitment in the shock absorber assembly. Keeping the correct spacers in place ensures proper shock geometry and suspension performance. Features: Sold as a pair Precision machined to 3.5x6.3x2.8mm Designed for Cat PB 4x4 shock absorber assembly 7/7/26 cs