Sunroof Dart (1973) Question???

I own a #'s matching H-code 73 340 Dart Sport factory sunroof/fold down rear seat car. From my research of production #'s on factory H-code sunroof cars, we can only speculate, as there are no known figures. MY340 was keeping a tally of members here on FABO whom owned sunroof 340 Dart Sports and Dusters, so I'm inclined to believe that his % figures are pretty accurate. I too, have had mine to shows and received the same response he has. I know of 2 other H-code 73 340 Dart Sports in my area, both restored, one a 4 spd, the other auto. Neither have the factory sunroof or fold down seat options. Back in the 80's, a friend of mine had a 74 360 Dart Sport With the factory sunroof/ fold down seat option.