Rear Window Defrost

I have the opportunity to get for next to nothing a electric rear defrost window, that is in almost perfect condition, out of a Dart for my car. Were these part of the highly optioned Darts? Should I go for it? The guy says he thinks he also has the wiring harness for it too. He also has a pair of very nice 67-69 Dart doors, these won't work for me though.