VAG doesn't sell much in terms of service parts for the 02E, but I know Cobra transmissions sells what they call an overhaul kit, that looks to have all the clutch friction discs, some seals and gaskets, and a bunch of the little strainer bits and stuff from the M-unit. You may contact them and ask.
Other thing is if there are any bearing manufacturer (Timken, GMB, etc.) numbers actually on the bearing itself beyond the VAG part number, you may be able to google that.