How rare is a heated back glass on a 73 dart sport

Was wondering how rare a heated back glass on a 73 dart sport is, not a defroster, heated with the metal strips. Talked to a guy the other day that said dodge never made one. Just wondering if anyone on here knew how rare it might be




They made them that way. In colder places it was a good thing to check off the option list. Do you have a burnt orange 70 Challenger T/A? I would think that is a lot rarere than a heated back glass.