To use the Yokomo hub's you'll need a pair of Yokomo UJ's (straight swap for the B4 ones but metric fit instead of imperial) and the 10mm bearings........ then you'll find the hinge pin is too small for the wishbone and it'll be a loose fit
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I believe Rayspeed do 0.5 & 1 deg alloy hubs for the B4 - best thing is to get a set of them and sell the Yoke ones