From what it looks like on the parts sites, the 08 & 09 800 prop shafts have been replaced/ updated to the same prop shaft as the 10 800...which says you can also buy the replacement front yoke separately. The 11-14 800 carries a different prop shaft part number than the 08-10, BUT carries the same front yoke part number as the updated 08-10 prop shaft, same u-joint part numbers, and can purchase the rear yoke separately.
What I can't figure out from the diagrams is if the rear yoke of an 11 will work on the updated 08 prop shaft. It should fit fine on the prop-shaft, but I don't know if the splines are the same. Anybody know ??? If the spline count is the same, then in theory IF you have 10 or newer, or the updated prop-shaft on the 08 or 09, you SHOULD be able to buy replacement yokes.