Scat stroker crank main bearing question xtra clearance bearings?

mini said

These are better and full groove. About 30 bucks more for the set but they have the undersized .001

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I think Ms540h-1 are oversized bearings used when you have too much clearance with standard bearings. I need undersize bearings Used when there is not enough clearance with standard bearings which are the Ms-540hx.