Ring,Set,Piston,4-3/8",Packaged,Standard For Harley-Davidson

Front and rear cylinders and pistons are interchangeable and sold individually. You can also Increase the displacement of your X-Wedge engine with bolt-on Big Bore cylinder and piston kits. A 1/8" bore increase will take an X121 to X128, and a 1/4" bore increase will take an X117 to X132! No changes to the crankcases or flywheels are required.