Ah. OK. Very interesting... I guess if you wanted to put one back in after buying a reproduction harness, one could buy the parts and do it themselves. But that would involve cutting into a new harness or getting a bunch of wire.
I wonder how/why the tan wire isn't duplicated in the engine and extention harness.?.? Meaning, if the extention was just added, there would be two tan wires. Maybe THAT is why it was added???
Ah, the mysteries of this hobby!