And what do you know:
It has that sliding rear window! I didn't remember it until I saw it for sale at FHRA Auction which was held in last weekend at American Car Show 2016.
It was sold just bit over 15000 €. Too bad that I didn't have my flash with me so I couldn't any better picture of it than this:
But at least I gotto see it in person and that definately wrapped my head around getting one on my El Camino. Okay, I am running out of time for getting that for this driving season and also I have run out of money too, so it'll have to wait till next winter.