Not very common at all. I suspect those oversize bearings sold ten years ago at Ozzie's where ordered on mistake. I personally have changed a lot of airhead rod bearings and I have never seen one take oversize bearings. I have never heard of it from any mechanic I have ever worked with? There is still no need to plastigauge rod bearings. Measure the journals. You don't even need a mic. .010 or .020 or .030" is plenty easy enough to determine with a vernier caliper. Wrong size bearing? They will be too loose or stuck solid after you tighten the rod bolts. Who would do that?