Camshaft sprocket spacing alignment/thrust washer kit. Spacers / alignment washers are used to align the rear camshaft sprocket with the crank sprocket to achieve correct chain alignment. Kit included one thrust washer and one of each size cam alignment spacers. - 25729-06 Thrust washer front cam .100"- 25731-06 Spacer .110" cam alignment. Use as required- 25734-06 Spacer .120" cam alignment. Use as required- 25736-06 Spacer .130" cam alignment. Use as required- 25737-06 Spacer .140" cam alignment. Use as required- 25738-06 Spacer .150" cam alignment. Use as required. Note: Installation requires 2 spacers. Note: Correct spacer thickness is a must for proper sprocket alignment.