This clutch starter bearing ( 58440026000) is designed for use in specific ATV and motorcycle models.Compatible vehicles include: 450 SX Racing (2003–2006), 450 SXS (2003–2006), 450 XC-G Racing (2006), 450 (2005–2007), XC 450 (2006–2009), XCR-W 450 (2008), 450 XC-W (2007–2008, 2009–2011), 520 EXC (1999–2002), 520 EXC Racing (2000–2002), 520 MXC Racing (2001–2002), 520 SX Racing (2000–2002), 525 EXC (2003–2006), 525 EXC-G Racing (2006), 525 EXC Factory Racing (2005), 525 EXC Racing (2003–2009), 525 MXC Racing (2003–2005), 525 SX Racing (2003–2006), 525 XC (2006–2009), 525 XC-G Racing (2006), 525 XC-W (2007), 525 SM-R (2004–2005), 540 SXS (2001–2006), 540 SXS Racing (2001–2004), 450 XC ATV (2008–2010), and 525 XC ATV (2008–2012).The part is , standard quality, and sold as a single unit.Each unit undergoes functional testing prior to shipment.