Robbo has summed it up pretty well. Some stuff will and did vary. Tonneau cover as part of HZ Sandman is another example, lots of original paperwork says no but one or two pieces say yes, and yes is correct. You start to see the hassles I have in trying to get everything correct, you cannot rely for some information on one piece of information, often you can't rely on three pieces.
What will really help to solve this is a full HZ XU3 or XX7 production broadcast sheet. But then only for the one assembly plant.
The documents that are rarely or never wrong are broadcast sheets, features manuals and POA documents - but again you have to be careful as these documents were updated along the way and are only applicable at the time they were printed.
The unexplainable thing about Robbo's is the footwell lights, as at least until the end of GTS in 1979 there was no harness for quad headlamps without the wiring for footwell lamps. So the mind boggles on this one. Build sheet shows B1 for the harness.
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