Hi guys, I'm not sure if this helps out or not but..
I took all the belts I have from my rideon (old & current) to my local Bursons Parts Store. Using their Dayco Belt Tool, here are their measurements, as outside belt lengths.
Current Drive Belt = 10A x 2110mm
Current Deck Belt = 10A x 2240mm
Old Deck & Drive Belts = are both the same at = 10A x 2240mm
Note:- 10A = 10mm in width x 9mm in depth