I think we can help you find this, but I'll need more information. Please open the window as wide as it can go and take a few pictures of the arms that do the opening. They're an important feature of an operator, so we'll need to see them before we can make a recommendation. Thanks!
Thanks very much for the info, so bottom line, of the four part numbers you've listed which ones should I order? And also can I purchase them from you folks?
Thanks again, Ninus
Well, it depends on what matches. You'll have to carefully compare the specs we show for each part to your own hardware.
You can, indeed, buy our hardware on our site.