I'm kind of curious, I have 3, "36" Dictator 4dr sedans and all are the same. Can a person tell a tenite knob, from a chrome one? The mechanism in my picture, is from the rear door, passenger side. I've heard there was an option of a vent window for the front. So I'm assuming there would be a different mechanism for that option. The mechanism in Don's pic is what I have in all of my front doors. It's something I had never seen or heard of before. The window slides straight back a couple inches then goes down. And when all the way up, slides forward again to seal up. How many years and models was this used on? Kevin