Thanks for the links!
I am looking for the stainless one for a cleaner and more original look (and sound), but that one seems to be even harder to come by than the carbon one.
As a sidenote, my bike is a GS, and I was also unsure if the fitting is the same for both R and GS, and according to non-stop
there seems to be an extra fitting kit needed to get the Akra installed properly on the GS.
Not sure if the Non-stop has separated the products to make more cash, or that this is something that has gone under the radar.