Rear Window - F8

[David DeWeese]

Looked at my C8 today to see what rear window arrangement it had. Mine is odd in that it has the window moulding attached on the inside, but also shows traces of where a moulding had been on the outside, according to the old paint lines. There is also four rubber-padded clips in the corners to hold in a piece of glass.
Are these clips what originally held in the window? The reason I ask is that they look home-made. The truck has had a hard life and many modifications!
It was apparently a radio version due to all the grounding straps. Am I right in assuming this?
One other thing is that the recess in the window moulding, where the window should fit in, is exactly the same size as the hole in the back of the cab. So how would one keep the window from falling out without the clips or a second moulding?

Thanks, David