Yep - you found the same pictures I did.

The valves, lines and such that you've found were part of the kit that made the M38 and M38A1 semi-submersible. (The one you drove into the China Sea might have been OK if it hadn't been so deep...). Most people called it the fording kit, but as both of us found out - it was technically called the Engine Venting System and involved just about everything on the vehicle; fuel tank, transfer case, master cylinder, carburetor, distributor and even the valve cover on the side of the engine. Oh yes, windshield wiper motor too.

As I looked at things, there were lot of variations on how the system was configured as the M38A1 was built. Early and late production changed as lines and fittings were added or deleted. The good news is that most of the lines were not needed to just make the vehicle run, so crimped lines and brass plugs can substitute for most of the parts if they are missing.

Yee-Haw.