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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
I used a generic oil drain plug 20mm x 1.5..if you go to autzone ask for a Subaru STI drain plug from the back.
I did this because my oil sensor was leaking not from the $2 gasket, but from the little wire in the middle and I didn't want to spend alot of money on a new unit.