sprockets
9 mile machine in 9mile falls WA just north of Spokane can get you out an old style sprocket. About the same price, difference is he has sprockets and POLARIS/TIMBERSLED must of decided its a waste of time to support the old kits.
When you change your lower chain case sprocket inspect the keyway for fatigue cracks, four of these old drive shafts broken out laying around the shop now....now they are real solid tent stakes. If your lower sprocket bolt keep coming loose your shaft is cracked and will eventually break or your sprocket breaks in half or if you are going WFO when it goes it will likely take out more precious backordered parts.
For the $350 its likely better to upgrade to the splined shafts which have been on back order but dribble in on occasion. If you make a smaller spacer for the old top sprocket you can use the new lower splined sprocket/driveshaft, mix and match old and new, the top shaft and parts have been on backorder for ? aw who knows.