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@rogerzilla
There are a couple of different lockring standards, although the sprocket thread is nearly always the same (apart from some old Italian hubs).
Spacers under the sprocket on a track hub (they're OK on a freewheel hub, which has much deeper threading) are something to be avoided if possible, since the sprocket won't thread on fully and you may strip the hub when pedalling, plus there may be no space left for the lockring. Get the correct BB length instead, or get a BB that is slightly too short and put the spacer under the RH cup/flange to move it out by the odd millimetre.