you`re not alone badga:
this guy`s mecanic invented a spring loaded bolt on solution
http://www.xt-660.de/forum/viewtopic.php?f=9&t=13801
other case:
http://www.xt-660.de/forum/viewtopic...t=4441&start=0
we recently did have various similar cases in the german forum.
Options: weld a new bracket to the frame or make your own construction from angle and fix it with with the 2 screws of the boot protector (no welding)
Interesting is the fact, that it only seems to happen on XTX`es
good luck,
Joe