I have an Irwin 37CC and I am sure Irwin built the pedestals special for all their boats. Your only choice will be to rebuild the one you have. I had to rebuild mine due to cockpit sole delaminating due to plywood core rot (which made my pedestal wobble worse). I removed the pedestal, took it home and re-fiberglassed it from the inside. I then I painted it with Awlgrip and it looks better than new. A good site for such things is Irwin Owners Group
I will try to add some pictures this week but next week we are off on the Baja HA-HA and won’t have WiFi until Nov 1st.