Patrick,

You can get them from the dealer or from an aftermarket
supplier.  They will probably be the same mfg.- FAG I believe.
Once you get said bearing how do you propose to replace
it without tearing down the transaxle?

Todd Hill
VolksWerks Transaxles // VW dealer mechanic
Olympia, WA

PS- if you can't find them I have several on the shelf.