So after digging around for a while, I believe I found a solution.
On the 5.0, the positive battery cable has a couple of connections to the 'circuit breaker', with a final connection to the battery terminal with the clamp.
My clamp is starting to corrode to the point that there will be structural issues and break in the future. For the 5.0 and apparently the F150, the only plug n play OEM solution is to purchase the Positive Battery Cable from Ford; for the 5.0 it is $300.
However, there is a battery terminal clamp that is offered for the Ford Edge (BT4Z-14450-AA) which is same clamp you'll find used for in positive battery cable for the F150 and Mustang. Ford simply doesn't offer this clamp separately for the Mustang or F150.
You can purchase the BT4Z-14450-AA, cut off the old clamp with a Dremel, and them crimp the new clamp on. The caveat here, is a proper crimp tool (Open Barrel B-Type crimper) for 2 AWG size wire is ~$145. Others have used vice grips with a screw to brute force a crimp.
I finally found this wisdom on Amazon Reviews for the BT4Z-14450-AA: