GE Part Numbers...
Here's the GE part numbers:
Thrust Bearing Kit (Plastic and bronze spacers inside clutch): WH4X91
Clutch Shoe Set (Set of 2): WH7X110
The dates of manufacture on the kits I bought were 5/20/99 and 8/31/01 respectively. I don't know if GE still makes the parts or not, but at least now you know what to ask for!
The upper bearing can be cleaned out and repacked with grease in place. Once you have the clutch apart, remove the snap ring that holds the upper bearing in place. Chances are the bearing will be "stuck", but you can restore the bearing in place. Take a sharp knife and pry up towards the center on the rubber seal and work the blade around. The seal should pop up and you can take it right out. Be careful not to bend it! It does contain a small metal ring inside it that is easily bent if you're not careful.
Soak the top half in solvent to get the old nasty grease out. Once you've gotten all the old grease out of the bearing, make sure it's nice and dry. Pack the bearing with a good quality wheel-bearing grease and make sure you get it behind the ball spacer! I packed mine very tightly with grease. Be sure to spin the bearing several times to work grease throughout the bearing races. Clean up the excess and replace the seal and snap ring.
When replacing the clutch shoes, make sure that the shafts are polished and free of grime. Use some Acetone or laquer thinner if you need to in order to make sure those shafts are SPOTLESS! Before you put the new shoes on, put a drop or 3 of 3-in-1 SAE20 Motor oil on the bronze bushings to keep them from seizing in the future.
For a short dissertation on WHY I say to use this type of oil, see post 22574 in the Pink forum. The thread involves a GE Mobile Maid, but the same rules apply since bronze bearings are at play here!
For anyone interested, I documented the reassembly process in a Flickr photo album. I've commented on the pictures so you know what you're looking at. See the link below...