I thought to put it also here for future generations
First of all be aware that XR and R seats are interchangeable, the height stated below is from the XR, for R you need to decrees 5 mm or 10, i am not sure about that.
795mm - Low Seat (only seat without shorter shock)
825mm - Standard
840mm - High seat
845mm - Comfort seat
870mm - Extra High
I have F900 XR and find the original seat a bit stiff for me so i bought the comfort seat, except the 20mm+ height i felt no better comfort than the standard they are practically the same