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The SPC Performance aluminum axle shims are a budget heavy‑duty option sold six per box for correcting caster on over‑the‑road trucks and trailers. With average compression strength and hardness they come in multiple sizes so technicians can match spring pad length and width. When using Z‑blocks or axle spacers, spread the load to avoid shim crushing; this listing shows 2.5" width, 5" length with a 3.0° taper.
SPC Performance AL SHIMS 2.5X5 X 3 deg.(6)
