Dexter. Great to speak with you today. You can turn down the inserts or make new out of UHMW plastic. It machines great and wears like iron, we use it at work. Think Graingers sells 2" OD for bout $8.35 a foot. You will need a flange on top so better figure on 2 1/2" or 3" OD round stock. If you wish, I can bring my calipers home next Sunday and measure up for your seat adapters. U are only couple miles down 7 hwy. But-think Bass Pro is havin locator seminars from 2p-4p Sunday and gotta be there for that. U can text me, PM, or Voice Mail.