Hi Svenn
Both of the plates are 16" in length including about 1" of overlap in the full closed position.
Scroll down a little further on
http://canadianmilitarypattern.com/M...0Up%20Link.htm to
the Pattern 13 Rear Cab Sliding Window heading for several photos.
But as has been mentioned before there are several different styles for how they are made. So if someone could post some of the other styles that would be useful.
Cheers Phil