Stop !
you might all be wrong, i have seen this before. before you waste your money try this.
remove the micro stub, then get a long bolt and some large washers to compress the bearing assembly (the inner races together). once compressed then turn and inspect the bearing for free play if there is none then your bearings are not bad! i have seen where the microstub (or bearing) was replaced separately and there was a compatibility issue, what i found was the inside radius on the microstub was so big that it did not allow for the flat part of the micro stub to tighten (squeeze) the bearing assy together, the result is a loose bearing (and poor brakes)