Thanks Loz. I mailed the ventura people and have a copy of the instructions for D023. Looking at the D028, you can see the difference in underseat bracket which is why my rack doesn't fit the 1000
So, to confirm, the kit is for the S2R 800, part number D023, with fitting instructions kindly provided by Loz above!
Looks like it will also fit older S4R bikes as well...