Check the listing for details. GM Metric Brake Pad Spacer for 1978 - 1988 calipers; circle track racers. Condition: New. Listed at 7.64 USD. GM Metric Brake Pad Spacer for 1978 - 1988 calipers Adapts GM Metric Caliper to .810 wide brake rotor common on circle track race cars.Spaces Brake pad out .25" Overall Outside diameter 2.37"Piston Area outside diameter 2.045" ( where spacer slides into the caliper piston)PEM Part Number BCalsp1 You are bidding on one spacer Shipping via USPS First Class Mail Disclaimer. Warning! Auto racing is a hazardous sport. No warranty or guarantee is made or implied regarding any racing product sold by Performance Engineering and Manufacturing, LLC. User assumes all risks. We will ship using USPS Ground Advantage Mail with Insurance and will send a Tracking/Delivery Confirmation Number after shipped. WARNING: Cancer And Reproductive Harm- www.P65Warnings.ca.gov