Wanted: Aquatica 18458 Extension

I need the newer than year 2008 version for a 14-24mm lens. I can either offer a fair price or an even trade for the older version of this tube which is 3" long instead of the 2 1/2 inches I require for the zoom lens. The older version was custom made at the time for a kenko 2x pro teleconverter/105mm macro lens combo, allowing the focus ring to match up exactly when using the macro port.