Need help finding replacement casement window track and slider

A home owner from San Diego says:
We have two identical casement windows (Milgard I believe). One of them is missing its track and the slider may be damaged. So we are looking for what might work as a replacement for both the slider and track. I'm including pictures of the functioning window and the broken one. The track on the functioning one is 14.5 inches long. Do you know where I could find these, or will the roto track ( 39-542 ) and roto slider ( 39-541 ) on your website be comparable enough to work as a replacement? Thank you.
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Tom from SWISCO responded:

Hello! The slider in your photo appears to match our 39-529 slider, which itself is compatible with the 39-528 track. The operator, if you need it, will be our 39-253LB . The cover and handle that you want are the 39-451 assembly.

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Comparing the 39-253LB & 39-438B Operators
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Anatomy of a casement window
Anatomy of a casement window
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