I have fitted the large touratech sumpguard & the rear small sports rack.
These parts are listed in the touratech catalogue for the XT660R trail bike
but fitted my X model no problem.Fitting of both items was quick and easy.
All mounting bolts were supplied and simple instructions.
The sump guard took 6 weeks to arrive but is far stronger and stylish than the official Yamaha guard.The rack came in a week.
Touratech would be my first choice for any future add ons.Some parts may look a bit pricey,but the quality and fit is exellent.