Main Bearing replacement guideance

When you take the upper shell of the second set of bearing and slip it into the main cap as the lower shell the tab is the same just on the other side. Because it is now flipped over.

The only one this does not work on is the wide bearing at the back of the small block. The two tabs on the upper and lower bearings are in different locations but on the sb the rear bearing is usually full groved anyway.