Replacement viking channel

A quick learner from USA says:
What would be a good replacement channel for a Viking Channel/ 20 inches?
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Bob from SWISCO responded:

Thanks for posting. We definitely have replacement options for these balances, but I need a picture of the nylon attachments at each end to confirm what balance Series you're working with. Additionally, are the balances in your first photo from the same window, or from different sets? I ask because the bottom attachment visible on both balances looks a bit different. If you have different sets of balances with different attachments, we'll need the attachments and stamp codes for each set. Many thanks. 

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