If you don't want to wait for the parts to arrive, like me, with a creative solution, you can run the Vega with a b4 diff.
I also have a Vega 4.1 and a B4 donor car, with 2 shock o-rings and a metal shim on the outdrive before the bearing it fits the 4.1 gearbox quite nicely.
I ran a few nights now and it still holds up.
I have ordered the b4.1 outdrives and will change them once they arrive but for time being this works.
For our clay track I run piston 2 + 30wt all round, silver springs on the front, as we have dust on the track I swapped silver in the rear for a softer green spring.
It runs pretty good on our track, much more rear traction than a b4.
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