Here's one that meets your requirements:
Moeller Product # 032513 - 13 Gallon Permanent Fuel Tank:
Utilizes rotationally molded, cross-linked polyethylene plastic, allowing for complex shape designs beyond conventional and restricted aluminum tanks.
Our fittings hold the highest O.D. and I.D. tolerances in the industry, ensuring you the highest level of input flow available during tank refueling.
Machined aluminum 3/8" withdraw fitting has 360° rotational capability for hook-up convenience.
Ideally suited for gasoline and diesel use with appropriate return kit (Part No. 035724-10).
Helping you properly secure your tank, Moeller's Tank Cradle Hold Down Kit (Part No. 300110).
Conforms to all ABYC, NMMA and U.S. Coast Guard regulations.
Available with CE certification.
Product Dimension: 32.00L x 10.19W x 10.19H
Diagram
See -
http://www.moellermarine.com/aftermarke ... nent_tanks or
http://www.easternmarine.com/moeller-13 ... ank-032513 (I didn't look hard to find the cheapest price so other sources may be cheaper).