Genuine RHP bearings. Not cheap Imported rubbish as sold under this part number.
This is the workhorse of the Mini gearbox. This double roller bearing supports the shaft where it transmits the power to the wheels. When this bearing goes, the mainshaft loses it support and as a result can take out the rest of the box in a hurry. False economy to ignore this bearing when doing a rebuild and you need to fit the original genuine RHP full cage bearing and not a cheap imported replacement.
See
DAM2377 locktab also for this.
Also used on Mini automatic clutch case for 1st motion shaft.
USA customers beware, your customs officers are very stringent about any bearings being imported.