The actual dimensions of the Jerker (like the one shaped in your picture) is 120cm wide by 90cm deep (actual desktop size). I think the mk1 desk may be slightly different. Hope this helps.
Just putting together my setup with my Ikea Jerker in white. Can't say that I've ever seen another white version 2 before.
The reason for the gap between the monitors is because I'm hoping to put a 28/30" in there.