Window not able to close to lock

There is more that goes into identifying an operator than just measuring the length of the arm. I can do most of the work for you, but I'll need you to remove this operator from the window and show me a clear picture of the mechanism by itself and without obstruction. Please make sure it's one clear shot taken from the top-down.

With that, I am very confident that I can find a good match in our inventory. If dimensions become an issue, then we can cross that bridge when we get there.

Vinyl window trims like this can be tough to deal with. The last thing you want to do is break the trim on accident. I would start by gently prying up on the sill cover with steady pressure; it should snap off safely. If that doesn't work, you will need to remove the lower side stops.