1973 Duster & Dart Sport 340 SUNROOF cars

I just found a 73 duster 340 4 spd with the sunroof. The car is also a stripe delete car. I will send you more information when I get a chance. I was researching to see if I can get a production number of these. I would think they would be rare. Any idea of how many were actually produced? Also, where can I find parts, weatherstipping etc?
Thanksl