can't find replacement operators

A home owner from Tennessee says:
i have original 1960 awning windows, and despite searching the ends of the internet for any information on what type of operators these are and where to get replacements, i have literally come up with nothing. at this point, im just wondering how much of a task it would be to basically retrofit these to a current style operator, or if that's even possible at all. also, please excuse how filthy and damaged the windows and sills look. i don't think any of the previous owners did anything to this house in the last 60 years but screw things up. anyways, any info you can give me would be much appreciated!
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Emily from SWISCO responded:

Thanks for reaching out to us. We don't sell an exact match for this. The best options available in our inventory appear to be the 39-040 and 39-370 but we can't promise it will work for you or predict the amount of adaption that is needed, unfortunately. Take a look at the specifications and see what you think. 

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