Voltage Regulator Rectifier For Ski-Doo Formula MX Z MX ZX Summit 1999 2000 2001 2002 2003 OEM Repl.# 515173200 515175216 515175491 Brand new aftermarket voltage regulator rectifier direct replacement The Quality exceeds the OEM equipment Plug-and-play unit, direct fit, easy to install. All products shipped are tested One year limited warranty