Rear Mounted Tank Conversion - Filler Neck?

I've got an opportunity to purchase a rear mounted tank and skid from an intermediate to convert from an underseat tank, but the seller no longer has the filler neck assembly. I guess I'd need the tube(s), the end that mounts to the tub, and a cap. Does anyone know if these parts are still available anywhere?

 

I got a used one from a junk yard. You may not be aware that there are two hoses on most rear tanks. The second and smaller hose allows the air to escape while the tank is being filled. The filler head with the gas cap has a tube where this hose attaches and a metal bracket that attaches to the the body.

 

The filler hose should be available at 4WD Hardware or Krage...

 

Just purchased an entire set up from discountjeepparts.com. I must say, I had an excellent experience with the customer service and these guys know their stuff, could probably help out with the retrofit too!

 

the aftermarket carries 1978+.

 

Looking on various suppliers websites, I can find the filler hose for an intermediate, but not the filler neck. I do see later model filler necks, but they take a smaller hose that also has a vent hose. I guess I should pick up the phone and actually talk to a human to see they carry them but don't list them on their site.