GU windows
Thanks for your patience during this busy season. GU operators like this aren't made anymore, but we're currently looking into a possible substitute that you can use. Please give us a little more time to research your options and I will do my best to get back to you ASAP.
I've worked on your operator in the past and did actually come up with a working solution. What I did was remove that arm extension you have on your operator and install it on the end of the 39-027E. It was a little bit of work but it ended up getting the window working again. If you're handy then I think you should do it.
One thing to note was that I remember not having a lot of clearance under the window, so keep that in mind.