If your speedo side bearing is trashed then all you probably have left is the sleeve on the axle and that will be much easier to get off on the work bench so don't worry about that side yet.As far as the chaincase there's a bunch of things to remove before you get at the bearing in that.The exhaust comes out,loosen the track tension off,drain the oil from the chaincase,bolt on the inside of the tunnel that drains the case,loosen the chain tensioner,take the outer cover bolts out and pull the cover.To save some mess use some rags stuffed under the chaincase as much as possible to soak up whatever oil is left plus you can take some brake cleaner and spray the guts of the chaincase down to really clean it up.Take the bolts out of the inner case and use a couple of pry bars to wiggle the case off of the jackshaft and axle.Take the parking brake and rotor off with the inner case half because trust me you don't want to take that mess apart and have to remember how to put it back together after with so limited room.There is a piece of key stock that holds the rotor onto the jackshaft so be aware that will fall out,plus there is a shim/washer and a collar that goes between the rotor and the case.Now that the chaincaseis out of the way you can crawl under the sled and work the axle out by pushing it out through the chaincase side as much as possible so the other end will come out from the speedo side.Now you can get at the rest of the old bearing.
As for new parts :
UB205 is the NTN number for the speedo side bearing
6205 is the upper and lower chaincase bearings
Outer chaincase bearing is 6204
axle seal would be a good idea to change as it probably went through some distortion in that 20 mile ride home.
