All Special Service Mustangs were dealer-only, special order units, and thus
also have the six digit DSO codes. If a particular state, such as Florida, ordered 50 SSP Mustangs in 1985, that order would have the same Special Order code and the cars would have all been comparably equipped option-wise. Some states apparently split their orders, or took delivery in stages, and were given more than one special order number. Also, it appears that changing the option content drastically amongst the order would result in more than one number being generated, as is the case with the unmarked cars ordered by the Florida Highway Patrol (mostly automatic cars, in various colors. The DSOs for the 1993 model year are different between the marked and unmarked, as an example).
It's important to remember that the mere presence of a 6-digit DSO code doesn't identify a particular car as a Special Service Mustang. The code, when used in conjunction with other identified equipment, will certainly help in the identification process, as will the absence of the 6-digit format.
The images below come from the 1983-1993 Ford Specifications books, and further illustrate the differences between the Sales Office and Special Order codes.
Image courtesy of the 1984 Ford Car Specifications book.
Notice that the last 4 are the special order number, and not a "group" or set of options codes. Image courtesy of the 1984 Ford Car Specifications book.
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