B3 arms are too short to use B4 hubs and wheels.
You should use B4 arms, hubs, wheels and of course axles.
If you don't already have all the parts available I think it is not worth.
It is not hard finding B3 wheels on the bay...
Front is compatible..
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Associated RC10 B6 - B64 - CENTRO C4.2 - Cobra / B42 - TLR 22T
..and many many more!!
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