I was considering buying a GB36 in need of tank replacement and when I checked with American Tanks about 3 months ago the cost would be $35k with a 2-3 month lead time. That was to come to Florida and do it. They would send 2 guys and take a week.Hi, I replaced both of mine on my 1978 GB36 Classic. American Tanks in Southern California came up.... Cost: about $19K as I recall.