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I am the one who originally found these, and you can get them here.

https://marineengineparts.com/whiteca...nd-s-7003/

They don't have the built-in flare of the rod holder tops, but still work well. I am using many of them now, and they hold up well and do not yellow out.

To install, remove the rod holder from the seatback, slide on as tight as possible, measure the length of the rod holder from the bottom to the top of seatback, and cut the outer shell of the cap to fit above the wood.

I used them on this boat. See 1st, 6th and 18th photos. Click on photo then cllick again to enlarge full screen.
(this boat sold a few years ago)

https://boats-from-usa.com/boston-wha...-21-204314