https://en.wikipedia.org/wiki/Napco_Four_Wheel_Drive_Vehicles

No need to argue - most likely the NAPCO info above is correct.

Coleman info above is also probably correct.

Do you want to know (or, do you know) what/when the GM (Chevrolet) dealers could order either/both of them from a Silver Book (they are somewhat rare books)?
https://www.stovebolt.com/techtips/identification/Advance%20Design/index.html