I've put the gear diff in a b4.
So if you are running the B4.1 it's a direct fit.
If you are running the b4, then as well as the gear diff you will need the following parts.
B4.1 gearbox (9826), 4.1 t-plate (9621), 4.1 metric out-drive bearings, (10x16mm 9832).
The old gearbox will fit on the new 9621, t-plate.
MiCk B. :-)
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