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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.
Consider the possibility that you might need torque box work on these old foxes when you're getting ready to do uppers. BMR adjustable uppers and non adjustable lowers, love it.
I'd go with a set of matching uppers and lowers. I DO NOT recommend any arms made from square tubing with "hard" square mounting brackets on the ends (they tend to crack more than round tubes). Unless you go with bearing mounted (spherical rod ends) you will always run into binding upon suspension flex (unrated spring action). It is this flex/bind that causes structural failures in the control arms. Another solution to this bind issue is to grind off just enough of the bushing and metal insert ends to prevent this bind from occurring.