I was told by a pe ex employee that you can use a polaris axle if you shave 1/8" off the inner part of part of the offset where it clamps the rail. you have to do both inner pieces because the inner assembly is 1/4" wider on the polaris setup. I just check my last expert axle against polaris axle to make sure again on the way to make it work and it will. You can still get the polaris axle setup from HPE. I bought a few to do the conversion and keep my last expert around for comparison. Pm me on how you liked the floats setup on the expert.