Dutch-
My car had three little rubber spacers.
About an inch long, by a 1/4 inch tall, as well as deep.
- Sorry, I'm an American, thus I don't know metric
But, the spacers, placed on the bottom of the window opening are necessary (that's what I was told, anyway).
Since they are behind the chrome trim, vinyl roof, and covered in caulking, I can't take true measurements.
Hope that helps,
Ron