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DeSoto Identification Codes
You might try reaching out to Les Pesavento, the model year coordinator, to see if he can provide any input to those codes. I would also reach out to the club librarian, Geoff Overley, to see if he has any documentation (such as a data book for instance) for your car that can help.
Les Pesavento: email@example.com
Geoff Overley: DeSotoadventures@gmail.com