Hi Jerry, I had the A/S plant add a black/grey tank to my 54 FC and it sits below the frame right behind the driver side springs. If you'd like a digital photo I can take one for you. Write me off list for photo. (or anyone else who wants to see it) Patti Long Island, NY 1954 Flying Cloud 02 2500 Suburban WBCCI # 3321 Washington DC Unit Denver Unit VAC