Scat stroker crank main bearing question xtra clearance bearings?

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.
Wasn't sure on the part numb. I bought them locally. Needed them with my scat crank as well. Clearances too tight with std bearings