Yes, that's the one, but you'll have to ask NN's about the warranty. Bought mine direct from Wunderlich!
My bikes have been kept outside, as you see them, for over thirty years I've lived here, not the same bike(s) all that time though
An old sweatshirt with the arms cut off and sewn up for over the screen, then a soft cover, none abrasive, then a nylon kind of cover, then the blue heavy duty one. A long nylon strap (new BMW's come in their crates with them) pulled round over and under stops them flapping in the wind. Both bike's ground anchored.
The F800GS now eight years old, going on nine, 125,000 miles, still immaculate and no corrosion whatsoever
Edit ... in fact I've only just swopped the bikes round to take the 650 Xcountry in to use for the winter ... as you can see, I'm rather restricted for space. The Xcountry is immaculate too, but far easier to keep clean
I see you're from Sheffield, Rainbow have one of the covers in the last time I was there, but they're in total refurb at the mo, but open for business as usual.