thanks for the information, I checked the restorer and though a good article, it didn't cover what I'm looking for. This pan came off of an engine number matching car. I am working on the engine now. It seems I seen and article somewhere that had drawings of the pans and the approximate years of change. These holes have been stamped at the factory, not added later. The beads all match, so I don't think someone changed to a different dipper tray. Again, thanks for the info. Someone is sure to have what I'm looking for. Jon