OEM No: 45739-62B is 33.4mm and fits: 1957-70 Sportster
OEM No: 45738-73 is Polished 35mm and fits: 1973-E87 Sportster
OEM No: 45736-78B is Chrome 35mm and fits: 1973-E87 Sportster
OEM No: 45739-87 is 39mm and fits: L1987-2003 Sportster
OEM No: 45966-04 is 39mm and fits: 2004-16 Sportster
OEM No: 46009-10 is 39mm and fits: 2010-Present Sportster "48"