Sliding rear window

[Caspar]

Hi

is it different types of sliding rear window? On som pictures it seems like the windows is 3 parts, and other pictures shows what looks like 4 parts. 
And what is a fair price for a sliding window in good condition? 
Thanks from Norway 

[Tactical Bacon]

3 pane is factory, 4 pane is aftermarket.

 

I gave $200 for my 3 pane but that's almost 4 years ago and in America where there are a few more kicking around. 

[Caspar]

Thanks,