Ok, I've looked through about 40 threads. And I can't find out how to release the small plastic pieces that hold the window to the rail system. What's the trick? Does it take a special tool? I really don't want to break the window.
Wasn't there a picture of that posted, at one time? I position the window, where I can use a punch, to move the pin in a bit, then just pop it out the rest of the way.
Here you go.. just in case they break for one reason or another: http://restorationpartssource.com/store/product160105.html