OEM No: 42410-52 Fits: 1952-56 K Model & 57-74 Sportster OEM No: 42420-75 Fits: 1975-76 SportsterOEM No: 42410-75A Fits: 1977-79 SportsterOEM No: 42459-80B Fits 1980-2003 SportsterOEM No: 42708-04 Fits: 2004-present Sportster