This is the same 1 5/8" diameter plated steel piston supplied in the MSE Gem LD19 Brake Caliper (Part No. 3599-200). It can also be used to replace the AP CP2195-14 piston in the original AP/Lockheed CP2505 (LD19) caliper. Sold individually, 2 pistons required per caliper.
Note: This piston is designed to fit the MSE Gem and Lockheed LD19 calipers only. It is not designed to fit any other brand.