We had a 1976 Chevy c30 Pathfinder 4x4 25 plus years ago. I found the parts list for that conversion and treated that document like gold. I was able to decipher the Pathfinder part numbers to cross reference to the Chevy / Ford / Dodge parts and what was Pathfinder custom. Those conversions used parts off of all of the makes.
I would only buy a Pathfinder conversion van that includes that document cataloging the parts, or f I could get my hands on it before buying. It is too much of a headache.
The conversion was sound and capable so that was never a worry.
I remember one of the younger guys that worked there ended up w a crap load of the parts and had some documentation. IF you can find him, he will be the Yoda you are looking for