This one-way starter clutch assembly with bead bearing is compatible with 999 Biposto (2004) and 999S (2003).It also fits the following models: Superbike series including 748 (1999–2002), 748S (2000–2002), 748R (2000–2002), 749 (2003–2006), 749S (2003–2006), 996 (1999–2001), 996S (1999–2001), 996SPS (1999–2000), 996R (2001), 998 (2002), 998S Bostrm-Bayliss (2002), 998 Matrix (2004), and 998S FE (2004).Sport Touring models include ST2, ST2S, ST3, ST3S, ST4, and ST4S from 2000 onward.