I'm not sure what thread it was in, but someone linked the below article from 2008, nothing too interesting, but it had a picture for a set of #3 main bearings that have a slot vs a hole (like in the Sanborn thread). I've looked in the clevite books and searched both jegs and summit, no luck figuring out the part number.
Maybe someone else has some more input
http://www.hotrod.com/articles/mopp-0806-mopar-clevite-engine-bearing-guide/
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