Steering Housing End Plate woes

[dephelps12]

After dumping a quart or two of 600W on my garage floor via the bottom of my 2 tooth steering box, I decided it would be smart to upgrade to one of those modern plates with the tube that sits above the oil level. The car was redone in the 70s so I figured it probably didn't have one. While prying the old one off through layers of paint and gunk, I make the unfortunate discovery that it DID have one, and only after I had snapped it. It is smaller in OD than the new one (about .425 OD") and the new one won't fit in my steering box. Any ideas on what sort of strange box I have or where I can get a replacement for small ID tube end plate. There was also some kind of packing in there behind the plate, but no gasket sealing the plate well to the housing, and this is where the leak was. Does a plate with a tube and a proper gasket seal take the place of this packing?