You can try and find a graphite arbor the right size. You will probably have to ream out the cork to fit the arbor. Check out mudhole.com you will find them there.
I have an otter xt 650 and I put led strip lights on the poles.I recommend using silicone caulk to glue them to the poles. the adhesive on the lights isn’t all its cracked up to be. Oh and by the way I love my otter, pulls easy over snow and drifts!