Aluminum window 3/8" balance and guides

A landlord from St. Jacob, IL says:
I am trying to find replacements balance. The window are about 5 pound aluminum windows. They are 3/8". I need 2 18" 14 21" and 2 25". I have attached pictures. I also need a few upper and lower guides. also pictures.

Thanks
Bill
A customer submitted photo of balance attachments.
A customer submitted photo of a window frame.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting, Bill! I can't believe you still have these windows. I haven't worked on these since the 1970's. These are the old Air Control and are not made any more.

I used to fix them by removing the old bottom clip and spring button and replacing them with our 17-014 and 17-015 Bottom Sash Clips. I will post more detailed instructions below.

The balances you will need will have to be custom-made, which will require you to fill out some forms. I will post a link for each of the three balance lengths you require after the installation instructions.

Here's how you would go about installing the clips:
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