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Sprint Car rear axle spacer kit. Kit contains a total of 19 CNC-machined billet aluminum spacers. Includes all the spacers needed to do both sides of the axle with infinite adjustments to within 1/4". Each spacer is machined to the correct ID to not rattle around on the axle. Don't be fooled by the other kits on the market that will only do a single side of an axle for the same price!