the only numbers I see are 2060 JG metal length is 21 inches

A handy person from San Bernardino, Ca. says:
This is a non tilt channel balance, 1/2 inch channel width 21 inches long. I am having a hard time matching the shoe attachment
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Tom from SWISCO responded:

Thanks for your photos. Based on what I see here, you have either our S351-21 or S390-21, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

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