Searching for balances 20 1 hu cmc 5

A quick learner says:
Aloha
I am looking for a balancer code 20-1 HU CMC 5 for IWC single pane windows
i have attached the pictures.
do you have anything compatible?
mahalo nui
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Tom from SWISCO responded:

We sure do! Looking at your photos, you'll need either our S351-21 or S390-21. The only difference between these balances is the depth of the bottom shoe. You'll have to measure your shoe to confirm the better choice.

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