I think that maybe these came from Alan Johnson---This is a rear main from Cruz Pedregon car-----

I have bored out individual mains and had crank journal turned to fit some other bearing on some exotic deals that were too $$$$$to replace but too good to throw away---thats what the progressive size chart areas of bearing cataloques are good for--for example, i think i did a 400sbc bearing into a Mercedes something or other for a few hundred dollars when a new block and crank were thousands and not available-----