Unknown part

A quick learner from Pontiac, mi says:
Do you know this part, and must it be replaced along with channel balances. Thank you
Thumbnail of the uploaded file named 16586157136628820205214960037990.jpg
Thumbnail of the uploaded file named 16586157859356950379195417284608.jpg
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Casey from SWISCO responded:

Hello,

It looks like you have a broken top sash guide, which looks similar to our 18-110 but we would need to see an undamaged guide removed from the window to make a confident recommendation. 

In the meantime, review the dimensions shown on the 18-110 product page to see how they compare to an undamaged version of your part. Thank you!

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