My guess is....Mustang One...he is a vendor. Been to his shop a few times, very nice guy and knows his Mustangs. I found a guy who restores the factory harness for less than $200, but there are no upgrades to it, so I will be getting Mustang One's kit.
Glad you started this thread, now I know where to get my kit once it gets back from the blasters.
Todd, does that headlight harness have relays and work with the new light kits? Which headlights (kit) do you like? Also do you have a kit for single plug instrument cluster? Looking for 6 gauge, something besides JME.
Good luck TCStang with your build.