1975 Duster 360 production numbers?

Unfortunately, Chrysler did not track very many combinations of options. The best you can hope for is engine/trans combo numbers, and in this case, VS29/sunroof combo numbers. An internal Chrysler Options & Accessories report would tell us that, but you would have to hope that a copy made it into public hands, and if so, the person that had it would be willing to share the data.