Andersen window casement operators

This is an old, old Andersen operator. I'm afraid we don't have an exact match for this. My first thought would be for you to contact an Andersen dealer in your area to see if they have some old stock lying around, though I got a feeling they'll charge you an arm and a leg. 

The only other thing that comes to mind is maybe substituting with something like our 39-435 operator, along with the 39-542 track. I've never done this myself, so I can't confirm if it will work, but it may be worth considering. Look this hardware over and let me know what you think.