3D printed track cover for Sankyo machines with acid green plastics on the back, can fit over versions. White version in the picture is the 3D printed product, it is about 5.75 " long. (Check with us on other versions to verify fit) The 3D printed design uses a friction fit on the slider instead of the spring seen on the original, if you want to install a spring you can but it is not necessary. Includes instructions along with the part, and shipping by USPS is included.