The part number for the 6 bladed impeller is the same as the one listed in the link you provided. In talking to my dealer the 6 bladed impeller was stock on the 926501 (1336). Mine was ordered through my Ariens dealer (CAD$177) in spring 2018 but was built in Montreal, Quebec, Canada and was not in a box. Getting the old impeller off is quite the challenge. Putting the new 6 blade impeller on is easy, it fits perfectly but sits just a little more forward toward the auger, so it fits the chute opening better. It is also slightly larger in diameter so the gap to the housing is less. Each blade has a larger surface area. Check your engine speed as 3,600 +/- 100 rpm for best results.
Check rear gearbox seal since replacement is easy when doing the impeller replacement.
Ariens plastic skid shoes are excellent, much better than Ariens steel ones.