Spacers fit stock and stock replacement early style camshafts and conversion cam plates which update the early style camshafts to the late style hydraulic tension systemConversion cam plates use the original style 99-06 camshafts with the original style silent chain in the rearSpacers are used to align the rear camshaft sprocket with the crank sprocket to achieve correct chain alignmentKit includes one each of the following thickness spacers: 0.297'', 0.307''. 0.317'', 0.337'', 0.347'' and 0.357''Made in the U.S.A.