In this case, the measurements should be taken up to mm. from one end of the window holder to the other end of the other window holder (see picture), both in width and in height. These are the final dimensions that you have to specify in your order request.
The measurements in height of a blind with a flat guide should be taken from one end of the upper window holder (the bright part) to the other end of the lower window holder (including the holder itself), as shown on the picture below.
The measurements in width should be taken as shown on the picture below.
