Starter relay replacement for motorcycles.Compatible with OEM part numbers 59040001000, 78040001000, and 58211058000.Fits the following models: 400 EXC RACING (2000–2007) 250 EXC RACING (2001–2011) 400 EXC RACING SIX-DAYS (2001–2007) 520 EXC RACING (2001–2002) 520 EXC RACING SIX-DAYS (2001–2002) 520 EXC-G RACING (2002) 450 MXC-G RACING (2003–2004) 525 MXC DESERT RACING (2003–2004) 525 MXC-G RACING (2003–2004) 525 EXC-G RACING (2003–2007) 525 EXC RACING (2003–2007) 525 EXC RACING SIX-DAYS (2003–2007) 525 XC DESERT RACING (2006–2007) 525 XC-G RACING (2006) 400 XC-W (2007–2010) 450 XC (2007) 450 XC-W (2007–2011) 525 XC (2007) 525 XC-W (2007) 400 EXC FACTORY (2005–2007) 400 EXC (2005–2011) 450 EXC (2005–2011) 450 EXC FACTORY RACING (2005–2007) 450 EXC-G RACING (2005–2007) 450 EXC RACING (2005–2007) 450 EXC RACING SIX-DAYS (2005–2007) 525 EXC (2007) 525 EXC FACTORY RACING (2005–2007) 450 XC ATV (2008–2010) 525 XC ATV (2008–2012) 450 XCR-W (2008) 530 XCR-W (2008) 450 EXC-R (2008–2009) 450 EXC-R SIX-DAYS (2008) 530 EXC-R (2008–2009) 530 EXC-R SIX-DAYS (2008) 530 XC-W (2009–2011) 530 XC-W SIX-DAYS (2010–2011) 530 EXC (2009–2011) 530 EXC FACTORY EDIT (2010–2011) 530 EXC SIX-DAYS (2010–2011) 450 XC-W EDIT (2010) 450 EXC EDIT (2010–2011) models Disclaimer: This is a compatible replacement part.Any brand or model mentioned is for compatibility demonstration, not endorsement.