I am looking at a CK-6 Business Coupe that is for sale. It appears to be early production, engine number CK 1808, serial number 5,000,580 body number 377-77. What surprises me is that it has the narrow radiator shell of the K series, not the wide shell that I thought was on the CK series. It does have the lights on the front fenders, and a mechanical fuel pump that I believe are correct for the CK. The engine number is stamped on the driver side frame above the pitman arm so I presume the engine, frame and body are original. Could Desoto have phased in the wider shell such that early CK had the narrow shell? One other thing that strikes me as odd is that the trunk lid is wood framed when the rest of the body and doors are steel. The hinges appear to be home made so I am wondering if this panel is original. Any help would be greatly appreciated.