Will the orginal track with the new operator?

A home owner from Santa Cruz, CA says:
I need to replace on of my casement operators (from 1958, I believe) which looks identical to the picture of #39-021. Can I safely assume that the original track will work with the new operator?
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Dave Sr. from SWISCO responded:
I do not see why not. The replacement operator is made to fit the existing hardware. If your operator dimensions match up to the 39-021 dimensions it should work with your existing track. If you need more measurements of the 39-021 operator to be sure, ask for them here and we will take additional pictures of the 39-021 operator for you.
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