You have to swap the front axle/steering arm to the old FT bearing style stuff, and add washers to the rear (or the old FT spacer) and it will work just fine. I have a set of axles/steering arm/carrier all assembled and just swap the entire assy at the arm. makes it super easy to swap back and forth between hex/pin bearing.

Or maybe you can just remove the hex...im not sure about that, never tried lol.