Other Forum readers may like to know that in the UK (and elsewhere in Europe, I believe) the 2014 onwards XT1200Z model doesn't come with the pillion grab rails, which means that none of the Givi pannier rails fit, even though Givi's website states that they do. I purchased the PL2119 pannier frames in November and I'm still waiting for the UK Givi importers to come up with a solution so that I can fit the rails to my bike.
Looking at the fittings for other luggage manufacturers, only Hepco & Becker seem to make pannier frames to fit both the XT1200Z and the XT1200ZE, by providing bigger spacers for the Z model without the grab rails. Yamaha list spacers as an accessory that you have to buy for the XT1200Z if you want to fit the factory pannier supports, but I don't know whether these would work for the Givi (or other manufacturers') pannier rails.