Larry,
Welcome to the site. I have an '89 23 CC w/ 200 Yamaha. I replaced the tank this spring with 133 gal. aluminium from
sptanks.com. They built to my specs and coated with epoxy. Nice tank. Included an electric sending unit installed.
My tank was foamed in and had several small leaks where the foam was touching. The fill tube was cracked and leaking as well.