Eaton HO52 fill plug needed

[saltynuke]

I'm hoping someone out there replaced their rear end and still has their old Eaton HO52 10 bolt diff cover with the fill plug. I've tried every auto and plumbing supply store in Northern Virginia with no luck. The plug appears to be 1-inx20. I am really close to modifying my diff cover if I can't find a used plug. Please let me know if you have any suggestions-- the PO managed to get by with a load of Permetex around the broken plug. My '69 C20 Camper Special thanks you!