This is the area from above (body removed). In my “before pics there was no floor to photograph!?! I’ll look through to see if I have any after pics of the tub floor and line routing.
Yep, I think I left them out of the build thread because they are so dark...
This is the line coming out of the tank fitting. It has a little loop that brings it back to the tub floor and gets it heading directly to the left side of the tub.
Here we are looking from the left towards the right, just behind the spare tire holder. To the right you can see the “loop” mentioned above bringing the line back up to the tub...and then one of those “O” clips attaches it there, about at the center of the car. Towards the left of the pic you can see the bend in the line turning it forward forward, so it runs down the sloped portion of the tub (on pre-60k cars...this area is a bit different post 60K).
As the line nears the edge of the tub, where the inner wheel liner is spot welded, it takes a 90 degree turn to go downward towards the frame. Here another “O” clip holds it to the tub.
This shot sorta shows what you already noticed...until you hook the hard lines together, it looks like either frame opening would work. But, the outer one gets the grommet and the line...the inside hole is for the spring pin removal like Tim mentioned.