Hey gang.
Not sure if this is old news. Anyway, it was news to me, so I figured I'd let you guys know.
Just brought home the '08 catalogue from Hepco and Becker. And whadda ya know; they've allready got a rack for the Z.
http://www.hepco-becker.de/_eng/frameset.php
On the website, as you can tell, there are no prices. So I've listed the price here in Euros. Bare in mind, that these are the prices in Denmark. When I called H&B directly, they said that the price may be quite different from country to country. But they should give you an idea of what pricerange we're talking.
Art 6504526.0001 (sideracks): 222.512 Euro
Art 6504526.0101 (luggage rack): 83.911 Euro
Art 502405.0001 (engine crashbars): 206.963 Euro
Art 5054526.0001 (center stand) : 184.577 Euro
Once you've got the racks, you can place pretty much any H&B pannier on it. So I haven't listed the price for those since that is subject to personal preference.
On a sidenote; they've now got engine crashbars for the R for the '07 and onwards models (the one with the annoying lambda probe).
Torsten
PS/Edit: Sorry the link is not working properly. They're using php so I can't guide you to the correct link. Just go here
http://www.hepco-becker.de/_eng/wahlHersteller.php and choose Yamaha, then XT 660 Z Tenere, to see what products are available for that specific bike.