[JCD]

You can't see it well because I have a tool carrier over it.
But the left side tank filler goes down the inside of the bed, surrounded by a squared off structure that was painted the same color as the metal bed interior.

The right side tank has the aluminum door halfway down the bed wall, and the tank has a small filler cap inside between the inner and outer fender.

Other than being different ways to fill them, the tanks are the same, that is mirrored to each other.

J.