Help finding balance part

A home owner from Sunnyvale says:
I want to find this part. I do not have much imformation but I know that the channel balance which is with this part is your 26" Series 385. Please help me to find this part I need to replace it.
balance guide
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Tom from SWISCO responded:
Hm... I can't be precisely sure if our 18-171 stepped sash guide is a good match for you. Please take a look and carefully compare yours to ours. Get back to us with some thoughts.
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