My search results:
A few months ago I replaced the main 93-gallon fuel tank last year on my 1991 Seafarer 228G and used Phil from Alloy Metal Works in Farmingdale, NY 631-694-8163. I removed and delivered my old gas tank to Phil, and he properly disposed of the same for free. I had purchased online from WEMA, a great sending unit at 30% off the listed price and had Phil install it on my new tank. As for the tank coating, at Phil's recommendation I applied three coats of Zinc Chromate to protect the tank from corrosion and then glued neoprene strips with 3M 5200 Adhesive to the bottom areas where the boat well's tank supports are located.
Hardways,
If you can get the dimensions from GW, I can get you a tank from RDS Aluminum for a bit of a discount...
.125" wall thickness, baffles, and sender, shipped to your door...
Florida Marine Tank and RDS made aluminum tanks for GW at one time.
I used RDS to replace the tank on a 19 Tournament that I owned. They had the plans and were able to custom build me the exact replacement in less than a week's time, then deliver it to my door via UPS.
Their phone number is: 850-584-6898