Would have had to been built with non-production options or paint and or a "fleet" (bulk) order to have a six digit DSO. Since four eyed Mustangs mostly did not have options grouped together, they could be ordered any which way you liked. There were some instances where when one option was ordered another item that was normally optional was required or included. For example, when a T-roof was ordered tinted glass (side and rear) was required.
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