I looked for the same, for the same reason, a month or two ago. Couldn’t find anyone with a set going spare so ended up buying new from Motorworks. Not cheap but an MRA Vario screen on the standard mounts has abolished the buffeting I got with the Tobinated ADV screen (however I adjusted it). A bit less protection but a good trade-off.
I was tempted by the WRS too but opted for an MRA which I’d had good experience with on an 850.
I had an MRA on the last 1150 gs I had before this ADV.
When I saw it I didn't like the look at all, but after a few spins realized how good it was, and left it there.
“To be able to mount this windshield on BMW R 1150 GS (No Adventure) you also need the original BMW attachment kit specific for your bike available separately in our store with the code KITBMW”