I know some think that the stbd tank is 60gal and port is 30gal for a total of 90gal. After owner a T37 for 24years there is no way we hold 90gals, even if you count the hot water heater and both sinks. I'm pretty certain port is 25gal and stbd a 50gal, that's measuring with jerry jugs. Looking at the Kracor 5069 looks like a match and is rated for 65gals, that's hard for me to believe. I replaced the port tank last year and it's a Ronco B470 Water Tank. Its a exact match and is only 25gals. I ordered direct, you can use a made up marine service name or a friend's company name and you'll get the discount and can order. The lead time when I ordered last year was 7-10day to ship, plus 5 to ship. I have weld repaired tanks before, and worked for 5 years. If you are tearing the boat up to get to it out, I would replace.
Here is the fitting locations for the port. If we can get the dimension for stbd that would great to keep for reference.