Hey, Paula. These are very old parts. I'm not sure if your exact operators can be acquired. Look at the list of hardware on the right side of this page. You may be able to get these to work, but I can't be sure.
Thanks Dave. I've finally getting around to trying to hunt these down again. Do you know how I might be able to determine if any of those will work? Maybe which measurements I should take of the window (as a reminder, i don't have the original operators)? Or is it possible to purchase them and then return them if they don't fit/work?