I have used the KX450F pegs from Torq 1
You can read about it and see pics here:
http://www.oem-cycle.com/forum/viewtopic.php?f=41&t=1170&start=70I have also used YZ426F pegs which I liked the fitment better on, and are the same as the following:
2000 Yamaha WR400F
2002 Yamaha WR426F
2001 Yamaha WR426F
2017 Yamaha WR450F
2016 Yamaha WR450F
2015 Yamaha WR450F
2014 Yamaha WR450F
2013 Yamaha WR450F
2012 Yamaha WR450F
2012 Yamaha WR450F Team Yamaha
2011 Yamaha WR450F
2011 Yamaha WR450F Team Yamaha
2009 Yamaha WR450F
2008 Yamaha WR450F
2007 Yamaha WR450F
2006 Yamaha WR450F
2005 Yamaha WR450F
2004 Yamaha WR450F
2003 Yamaha WR450F
2017 Yamaha YZ125
2016 Yamaha YZ125
2015 Yamaha YZ125
2014 Yamaha YZ125
2014 Yamaha YZ125 Team Yamaha
2013 Yamaha YZ125
2013 Yamaha YZ125 Team Yamaha
2012 Yamaha YZ125
2012 Yamaha YZ125 Team Yamaha
2011 Yamaha YZ125
2011 Yamaha YZ125 Team Yamaha
2010 Yamaha YZ125
2009 Yamaha YZ125
2008 Yamaha YZ125
2007 Yamaha YZ125
2006 Yamaha YZ125
2005 Yamaha YZ125
2004 Yamaha YZ125
2003 Yamaha YZ125
2002 Yamaha YZ125
2017 Yamaha YZ250
2016 Yamaha YZ250
2015 Yamaha YZ250
2014 Yamaha YZ250
2014 Yamaha YZ250 Team Yamaha
2013 Yamaha YZ250
2013 Yamaha YZ250 Team Yamaha
2012 Yamaha YZ250
2012 Yamaha YZ250 Team Yamaha
2011 Yamaha YZ250
2011 Yamaha YZ250 Team Yamaha
2010 Yamaha YZ250
2009 Yamaha YZ250
2008 Yamaha YZ250
2007 Yamaha YZ250
2006 Yamaha YZ250
2005 Yamaha YZ250
2004 Yamaha YZ250
2003 Yamaha YZ250
2002 Yamaha YZ250
2001 Yamaha YZ250
2000 Yamaha YZ250
1999 Yamaha YZ250
2017 Yamaha YZ250F
2016 Yamaha YZ250F
2015 Yamaha YZ250F
2014 Yamaha YZ250F
2014 Yamaha YZ250F Team Yamaha
2013 Yamaha YZ250F
2013 Yamaha YZ250F Team Yamaha
2012 Yamaha YZ250F
2012 Yamaha YZ250F Team Yamaha
2011 Yamaha YZ250F
2011 Yamaha YZ250F Team Yamaha
2010 Yamaha YZ250F
2009 Yamaha YZ250F
2008 Yamaha YZ250F
2007 Yamaha YZ250F
2006 Yamaha YZ250F
2006 Yamaha YZ250F 50th Anniversary
2005 Yamaha YZ250F
2004 Yamaha YZ250F
2003 Yamaha YZ250F
2002 Yamaha YZ250F
2001 Yamaha YZ250F
2017 Yamaha YZ250FX
2016 Yamaha YZ250FX
2015 Yamaha YZ250FX
2017 Yamaha YZ250X
2016 Yamaha YZ250X
2002 Yamaha YZ426F
2001 Yamaha YZ426F
2000 Yamaha YZ426F
2017 Yamaha YZ450F
2016 Yamaha YZ450F
2015 Yamaha YZ450F
2014 Yamaha YZ450F
2014 Yamaha YZ450F Team Yamaha
2013 Yamaha YZ450F
2013 Yamaha YZ450F Team Yamaha
2012 Yamaha YZ450F
2012 Yamaha YZ450F Team Yamaha
2011 Yamaha YZ450F
2011 Yamaha YZ450F Team Yamaha
2010 Yamaha YZ450F
2009 Yamaha YZ450F
2008 Yamaha YZ450F
2007 Yamaha YZ450F
2006 Yamaha YZ450F
2006 Yamaha YZ450F 50th Anniversary
2005 Yamaha YZ450F
2004 Yamaha YZ450F
2003 Yamaha YZ450F
2017 Yamaha YZ450FX
2016 Yamaha YZ450FX
And yes, there will be grinding that you will have to do.
You can save yourself a lot of time and effort by buying some IMS pegs that are ready to go...
https://www.imsproducts.com/Products/index.cfm?ManufacturerSet=Kawasaki&maD=true&seD=true&tyD=true&ByType=trueIMS makes some sweet pegs for the KX500