it's a wilbers 641, has external reservoir and hi-/lo speed compression damping adjustment, as well as rebound adjustemnet, height adjustment and hydraulik spring preload.
the spring prload hydraulik part comes with a part to mount it at the exhaust screw, very nice.
the reservoir is under the pillion seta.everything fits nicely, without the need to modify anything.
i ordered the shock with a custom spring rate of 80N/mm. this is the softest spring allowed for the german TÜV. i'm really happy with it, because i found the original shock way too hard. i'm about 20 km/h faster on my reference track, too.
Still not enoug pictures, but you may find some on the wilbers site, if they already have it there.
i ordered ine on the dortmund show in March this year, there i could talk to the technical manager. nice guys there....