Try this pic of WB vacuum hoses and heater cable. Not sure if it suits other models, but i'm guessing factory air was not too different in location of heater and vacuum valves etc. With regards to the heater cable, something is telling me that it was two sections put together. Not 100% sure though.

WB AC Vacuum and Heater cable.JPG

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No...scratch that. I just remembered that older models had their A/C controls on RHS of steering column. WB pic may not be helpful, but i will leave it up in case.