Window will not close properly

Hello! Your operator looks like it could be a match for either our 39-253LB or 39-438B, depending on the design of the guide at the end of the arm. That detail is obscured in your photo so I unfortunately cannot determine that for you. The video guide below will go into more detail and help you pick the better match.

Regardless of which one you choose, you will also need the 39-451 cover/handle kit.