How do I measure my desired pleated blind with clamp carrier correctly?

To determine the order dimensions, simply take the height of the window sash (sash height) and the width of the glass inside , measured from left to right. Then add a total of 4 cm to the determined width (2 cm each to the left and right). In the picture they are marked as an overhang with an "x".
Note: Make sure to choose a smaller overhang if the window handle or other fittings could hinder the operation of the pleated blind.