Dave Sr. from SWISCO responded:
December 22, 2015
Looking at your photo it appears that you have an old style casement operator that mounts into the window sill. We don't have your exact shape or size, but take a look at our 39-021 and 39-520 track. This hardware is the closest solution we have. You might need to retro fit it, but it's worth considering. Let me know what you think.
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