Problem with "Air Time " Pylon

While checking out the stuff that came with our boat, I noticed that the plastic sleeve that fits inside the extended pylon and rides between the extended pylon and the boats' factory pylon is junk. Cracked the entire length, and brittle to the point that when it fell out of the pylon and hit the floor of the garage, it broke a chunk off..

"Air Time" is apparently out of business. Anybody ever have to replace one of these sleeves?
I wonder if a sleeve for another brand of pylon would work. I.D. should be standard at 2.5, but the O.D. might be different....

Thoughts?