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I think that would be a hard if not impossible thing to track down, someone else may have a lead but in the meantime what seem to be ailing the old harness?
If you had an old one you can just make a new one using the old one as a template. I did that for my 91 5.0. Are you talking about the engine harness or the complete truck?
Maybe try painless, they may have one or be able to make one up.
The integrity of the entire wiring harness is in doubt..Since I'm rebuilding the who thing I want to avoid any gremlins in the wiring..I do have the old harness but would rather purchase an entire new one, I'll try Painless.