Post size,model and mfgr--they all have different sizes and styles and keene even had different widths too, semi flare the best for both worlds-aka-crash/box or a flare-double gated ol'thang-John-
Why not just upgrade to a 3" I have all you need less the pump for sale. It works fantastic on the superfine gold here in Ohio as it was designed for. I have a Keene custom over and under sluice w/ crashbox, Keene 3"powerjet w/2" log and pressure hose, and some 3" suction hose w/handled tip will let it go for $300+ shipping here is some pics
A river runs through the Garden of Eden called the Pishon and in this river is gold and the gold there is good! Genesis 2: 10-12