2830 balancer with these ends and also end caps for windows

A quick learner from New york says:
Trying to find the right ones for my windows
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Tom from SWISCO responded:

Based on your photos, you have either our S390-29 or S351-29. The only difference between them is the size of the bottom fitting, which is indicated on their respective store pages. You'll need to measure your bottom fitting to confirm which one is best.

I am confident that our 18-039 can replace the top sash guide.

A quick learner from New york says:
Thank you Tom!
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