Dave Sr. from SWISCO responded:
February 28, 2017
Thanks for contacting us. I'm not sure if you would have the width to use the 13" arm. You would need to check to make sure you have room, otherwise the window may not close. To play it safe I think you would be better off using the 9-1/2" arm. The worst case scenario is the window won't open as far, but that's better than it not closing all the way. You also won't have to replace your track because the end nylon bearing should fit. Another thing to keep in mind is since the arm length is a bit shorter you might need to re-position the track on the sash. I would install the operator first then see if you need to move the track. It may work fine.
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