I added the following seat to my 2320. I built the box its on but long before I built it the seat fit perfectly on the pedestal that was on the boat. Just unscrewed the original Parker seat and screwed this on. I got mine from overtons but probably should have got from manufacturer's scratch and dent store, heres their website - http://www.springfieldgrp.com/products/ ... up-1043001 and pic of seat on my boat. Also, I really like that it's a leaning post when you are cruising around and very comfortable.
Those seats are actually too nice as my 23 is the walkaround with hard top so I need something that will withstand the weather being outside all the time and not in an enclosure. Springfield website is a huge help though.