Well I did change the seat pedestal on our 2007 AR210. I believe that I was made by Garelick. Here's the best that I can remember about swapping it out.
Just to let you guys know. When I purchased mine I discovered that Garelick makes two different adjustable seat posts that are 12"-17". One has an indexing feature that has a locking pin which secures the seat in 1" increments (
http://garelick.com/productribbed.php?pnumber=75635), the other just slides up and down for adjustment (
http://garelick.com/productribbed.php?pnumber=75535). Both are then locked down in place with a hand tightening knob.
I ordered the one without the indexing feature, but only because I had an Overtons gift card and that's the only one that they sold. It seems to work great.
Mine was an easy swap out for the original, the only thing that I had to do was drill a hole into the new pedestal for the bolt that limits the swiveling of the chair.
Here's a few pics of the old one and the new pedestal in place.
File comment: New Pedestal Extended
How to change it out.
My bolts were easy to remove. The "nuts" must be embeded in the boat somehow. Either there's a plate mounted down there, or "blind nuts" in place.
First I removed the seat from the old post by removing this bracket. Then the seat just lifts off the pedestal.
Then I removed the Pedestal from the boat by removing the bolts at the base.
Next I removed the bolt that limits the rotation of the chair, and pulled off this plastic bushing.
Then I positioned the new pedestal so that the handle was easy to reach when installed in the boat and drilled the new pedestal to fit the swivel limiting bolt in the correct position.
Hopefully this has the information that you're looking for. Please feel free to contact me if there's any information that I left out.