Well, I can't answer DeSoto specific, but I'll share the little that I do know. On my 56 Dodge, the hardtops (2 and 4-door) use the same front and back glass. The sedans (2 and 4-door) also use the same. I believe that the Dodge and Plymouth actually all use the same glass, but I am not sure how the DeSoto and Chrysler products fit into that mix, or if they do at all.

I don't know if that helps at all, but I hope so...