Championship Tour Edition Rail Cushions Mounting Guides & Technical Specifications for Pool and Billiard Tables Select by rail core thickness (1-3/4" or 1-5/8") from the following guides: K-55 Tour Edition Cushions (1-3/4") K-55 Tour Edition Cushions (1-5/8") K-66 Tour Edition Cushions (1-3/4") K-66 Tour Edition Cushions (1-5/8") Cushion Height Guide for K-66 & K-55