Where is the best place online to buy spun aluminum gas tanks? The project I am working on has 7.5"x48" tanks in it and I would like to go with bigger tanks. I don't have enough room to go over about 8" in circumfrence but I can go up to 60-66" in length. I looked on the Rex Marine website but I couldn't find tanks anywhere. I really don't want to drop the coin for custom built tanks right now.