I am about to put side windows on my canvas with mosquito netting.  And I would like to make them the same exact size as the originals.  So now, I would like to ask some of you to measure it for me how long and how high the side windows are on the canvas.  That way I will know how long zipper I need to buy for both sizes.  
It is an unusual favor to do, I know.  
Thanks in advance to anyone.

Zoltan