Thanks to Jim, and a lot of miles on my truck and trailer, I now have a shiny new (to me at least) pair of Avid floats with the water rudders. BTW Jim is a great guy, and has a really nice place up there in the northern midwest. It was a beautiful drive up and back with the fall colors coming to full, but I wouldn't want to be there in January! Jim is a hardier soul than I am!
However, I'm fresh out of tubes and hardware to mount them with. I have the build manual, and it has a lot of pictures so the geometry and general layout are easy, but the only dimension anywhere is that the centerline of the floats should be 68 inches apart. The tube diameter I can pretty much get from the through tubes on the floats. I won't know the wall thickness, but if in doubt, I'll just get one thicker than I think I need. If anyone can give the me the length of any of the mounting tubes, or the distance from the bottom of the fuselage to the top of the floats, I should be able to figure it out from there.