Replaces the expensive Ralt RT-4 annular slave cylinder with the modern cylinder used in RT 40/41 cars. Requires modification of input shaft housing and re-plumbing. AN-3 hose-to-cylinder adapters and release bearing for 7-1/4" racing clutch are included. These kits fit the standard RT4 and other FT-equipped cars using the 2 1/4" adapter ring and Cosworth motor with metallic clutches. Carbon clutches require a custom installation.