Hello, I had a top bearing go out on my 2012 Skidoo GSX SE 600HO ETEC XR and it wore on the gears. Looking to buy the top 23tooth gear#504152593 and the bottom 45 tooth gear#504152593. I also might be interested in a new top and bottom bearing, with 104 link chain, and even the gear case as a spare#504153055(old#) or 504153405(new#).