Interesting that you should post this, Moley. I've seen them referred to in numerous reviews, (always favourably), but I've never seen them mentioned on our forum and I was wondering if anyone here had tried them.
Then, the other day, I received a junk mail from CNC Racing saying that they produce a complete replacement throttle tube that does the same job as the spacers.
https://www.cncracing.com/en/product...bw-ducati.html
Anyway, the CNC site says their tube fits the M1200S for all years 2014-2019 inclusive, so I'm guessing the spacers would have the same fitment.
If you do fit them, or the throttle tube, let us know what you think.