Daytec Fuel Tank that was used on Big Dog production motorcycles. We have a couple extras that we are clearing out at a discount. The tank measures 22" length at its longest point. Width: 14.5", Tunnel Length: 21", Tunnel Depth (deepest point) 6-1/2", Height: 8-1/2". The tunnel width is 2-1/2" and will accomodate upto a 2" diameter frame tube. The bung for the fuel valve is an industry standard 22mm thread. 4.3 gallon fuel capacity. This was the factory tank on the 2004 Big Dog Boxer.