Looking for a wing tank that fits a metal spar wing. I have an older Wag aero 12 gallon tank however it is slightly too tall. The tank will stand proud of the ribs and be an obvious protrusion. I have monkeyed with placement to the extent possible yet remain dissatisfied with fit. I have heard this is a common complaint, I have also heard the Wag aero 8 gallon tank fits inside of rib profile and does not protrude above or below. Can someone confirm fit the 8 gal tank? thanks tom