Non Tilting Double Hung Repair

A quick learner from Connecticut says:
This house was built in 1988 and the windows are original. There are no mfg markings. The window do not stay open as the cords have come off. I don't want to tear them apart until I am sure I can get repair parts. I did not see anything like these windows on your sight. Can I retrofit any parts you sell ?
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Casey from SWISCO responded:


The fitting at the end of the pulley cord reminds me of the 15-159 Malta pivot shoe at first glance. Take a look and compare the specifications below to an undamaged version. Thank you! 

Alternate image for 15-159
Alternate image for 15-159

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