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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.
They're around $440 from summit racing. DTL-913A561 (That part number is for 31 spline, I'm sure there is a 28 splined one, but I just quickly looked for the price.)