I am going to go with a driver's side only fuel filler, but only could find a passenger side fuel filler tube in the shop. Rather than order a new driver side filler, which I couldn't find online, I figured I would just cut the passenger filler tube and rotate it to fit the driver side with a piece of 2" exhaust as a coupler. As soon as I did this, I realized that I should add a filler vent to vent the tops of the fuel tanks back to the filler. This keeps it a sealed system unless the filler cap is removed for filling and allows ventilation of the tanks during filling to speed up the filling rate. Anything else I should think of? Will still have a small tank vent in the system.
Cut some tubing from a wiper arm. Tapered the end for welding, hole drilled in the exhaust tubing.
Welded it up
Probably overkill but took 30 seconds and added beads
Not sure how well the original tube lines up, but the extra length and control of rotation makes this perfect.