Identify Window Channel Balance parts

A quick learner from Boston says:
Hi,
Planning to replace Window Channel Balances on aluminum windows.
Pictures attached.
Thank you,
Lenny
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Tom from SWISCO responded:

Based on your photos, you have either our S390-28 or S351-28. 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. 

For your top sash guide, I recommend the 18-110.

swisco.com
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