Shim Kits Shim Kits These shims allow proper alignment of the front pulley. Each kit includes all 5 sizes for your convenience: 1 – .020″ thick 1 – .030″ thick 1 – .050″ thick 1 – .075″ thick 1 – .100″ thick SK-1 Shim KitSK-2 Shim Kit