20 hd

A contractor from Minneapolis says:
May 18, 2021
Need to find these replacement parts do you guys carry them?
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Bob from SWISCO responded:
May 19, 2021

This might be an S751-21, but I can't be certain from this photo. Please remove and show me the balance channel from the top end, as well as the attachment at its bottom. 
21" Series 751 Channel Balance
21" Series 751 Channel Balance
S751-21
$10.56
How to install a ribbed tilt channel balance with knife lock shoe
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