OK, some pictures from me!
Top view of the 4oz Tetra tank in front of the throttle servo mount.
Looking thru former F2 where the fuel line run to the front.
The outside showing the blue fuel line (with shut off)
and the pink muffler pressure line.
Fuel lines to the Jett 426 and a Tetra 6oz & 4oz. for comparison.
The 5.25oz tank goes thru F2 slightly, so I use a piece of strapping tape on the bottom & top side stuck to each other to be able to pull it out if needed.
Hope this helps you some,