Hey Rick. I believe you're referring to the window hinge. If so, see if our 36-004-10 10" Hinge Set matches what you have. This replacement is stainless steel so you should be able to avoid the rust that seems to have befallen the old hinge. Take a look and let me know what you think.
Great! Let me know if our size differs from yours in any way. To be transparent, the dimensions you should be most concerned with is the length of the base track (10", in our case). The precise hole placement and arm lengths will very likely differ from your original. In my experience, you'll sometimes get lucky and have those holes line up with the existing screws, but in a lot of other cases drilling new holes is necessary. Just something to keep in mind. As long as you replace both the top and bottom at the same time you'll be okay. You never want to mix old and new hinge assemblies.
As for the range of movement, that'll be fine. Odds are your hinge would have the full 90 degree movement but is limited by the operator.
