Spiral balance for sash window

A quick learner from Toronto, Canada says:
Hi, I need to replace 3 of these balances. Please let me know which ones I need. It looks to me like the S500, but with a different tip on the spiral (?).
User submitted a photo of a window balance.
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Tom from SWISCO responded:
I agree, the Series 500 is a good choice. As for the bracket, you could use something like our 17-012. See what you think.
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