one piece glass for 70 dart

I've been hunting around for a way to put one piece windows in my 70 dart. I understand I can swap the doors from a 73-76. my doors are in amazing shape and I hate to change the whole door. does anyone know if the later model regulator can be swapped in? has anyone done this and is it a PIA? thanks
I am not giving up my wing windows thats half my A/C system....lol. :elmer:

.