Patriot marine tanks is a good place to have one made. I had 2 tanks made there and the work was nice, on time and reasonably priced He is in Waretown. You can also try Atlantic Custom Welding?? North Jersey
SP Sheet Metal Company on rt. 37 in Toms River is good. They specialize in custom marine fuel tanks and they will ship it if you don't want to take the ride up from Wildwood. I had one made last summer. They did a real nice job.