Looking for replacement channel balance top

A handy person from Seattle WA says:
We have several windows where the channel balance top has broken out of the sash. These are Starline SL6000 series vinyl windows from ca 1999 with 1/2in nominal balances. Note that the balance top is secured with a screw into the sash.
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Emily from SWISCO responded:

Hey there!

Your top sash guide may be a match for our 18-171 but I recommend you review our dimensions and compare them with yours to see if you agree. 

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