Oddly for cheap aluminum bearings I get a hit from Israel made “King” main bearings that seem to offer the dimensions needed. I also see Glycols offered that I suspect are more tradition steel backed design.
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Quantity 1 6 Crankshaft Diameter 59.990 / 59.969mm 59.990 / 59.969mm Housing Diameter 65.001 / 65.019mm 65.001 / 65.019mm Max Wall Thickness 2.487mm 2.487mm Max Length 30.020mm 24.000mm FL O/S 29.92/29.87mm STD
Neither would drop in especially the thrust, but the non-thrust (6 sets!) show some promise of fitting the air cooled case bore and water cooled crankshaft.