RE: TT .46 Pro problem.
Jan,
[link=http://www.darrolcady.com/Tettra_Tanks/tettra_tanks.html]Tettra tanks[/link] are only offered (at least by Darrol Cady) in small volumes; and the choice is very limited.
Those offered by [link=http://jettengineering.com/accy/tank.html]Jett Engineering[/link] are more numerous and a bit cheaper.
1QwkSport2.5r, I'm afraid you will need to mount this type of tank, just aft of the engine.