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Bob from SWISCO responded:
March 3, 2024
Thanks for posting. This is a coil balance setup. Most likely this is a 15-087 Shoe, which uses Series 180 Coil Balances. However, without seeing the cam of the shoe I can't be 100% certain. You're going to want to make sure it matches what is shown below. If it doesn't, let me know. 
Detail of 15-087
These kinds of balance systems are modular, meaning each piece is sold separately and in theory you only need to replace what is broken. The tandem housing is the 15-086. The Mounting Bracket up the track is the 16-024. Finally, for replacing the coil springs you have to choose spring weights for each one. The spring weight represents the weight each individual coil can support. There may be stamps on the springs themselves that indicate this. If there are none however, or you're uncertain, the best thing to do is to weigh the window sash. Give us that exact weight and we can work out what you need. Unfortunately there's not a lot of choice in having to take the window apart first to identify the shoe, and to get the sash weight or the coil stamps. The diagram below shows how all these components come together. The video below shows how to remove and replace a slightly different coil balance system, one in which just the shoe moves with the window sash, while the other components stay in place--but it might be helpful to get an idea of how to remove these parts all the same. Let me know if you have further questions.
Detail of 15-087
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