That is it. This was a brass piece used by the PO for the autometer sending unit. Being that brass is brittle, it did not handle to vibration very well. About 1300 miles worth. I also had an oil leak from the front so I think it was in bad shape to begin with. I now have a galvanized piece until I locate the correct adapter to mount the sender in the factory extension.
Midlife and I also replaced the oil pan with a nice shinny one. After removing the old one, we found it to actually be in good shape. So now I have an extra. The PO loved the blue sealer so now we have real gaskets in place and no more leaks. Getting better all the time.