Nice find!
I had the S4R version (DU333) on my S2R 1000. I fitted the preload adjuster on the right pillion mount (see pic) and the reservoir hung length-wise on the left subframe below the saddle.
The Öhlins instructions say the reservoir should be mounted on the right, forward of the rider's pegs, on the frame above the crankcase. Great for cooling but not so hot on looks, hence moving it under the saddle. I had to cut a couple of slots in the plastic undertray to accommodate the hose, but nothing major.
If you're getting the shock rebuilt/refreshed, you might think about fitting a different length hose with appropriately angled banjos so that it fits exactly where you want it.
