If a bearing is supplied by BMW it will only have a BMW part number.
If you want Non-genuine bearings then you just need the sizes and the type.
Internal diameter, external diameter, depth and bearing type (Roller ball, taper, needle etc).
I've done a few 1200GS gearbox rebuilds. You will also need oil seals. And typically like BMW you need specialist seal drivers to seat the seals EXACTLY the correct depth or they will snag and leak.
May I ask what is leading you to change your gearbox bearings ??
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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