Trying to buy replacement

A contractor from Downey says:
Written on the piece is 16 3 IV CMC 2. We are trying to buy a replacement but don't know which one it is. Any help would be super appreciated.
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Tom from SWISCO responded:

Hello! I believe we can supply this balance for you, but right now there are many different possible replacements. The best match will depend entirely on the nylon fittings, which is what defines the "Series" we list in our catalog. Your photo here only shows the bottom nylon fitting, though. Would it be possible to see the top, on the opposite end of the balance?

Once I see that, I'll check our catalog for a match. I'm pretty confident that we have what you need.

A contractor from Downey says:
Thank you very much. Hopefully these are okay, I tried to get both ends in at multiple angles just in case.
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Tom from SWISCO responded:

These pictures are perfect, thank you. Based on what I see here, you have either our S351-17 or S390-17, 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.

When prompted, you'll also want to select the 1630 stamp option. This is based on your old stamp of "16 3."

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

A contractor from Downey says:
Thank you very much, just put it in our order :)
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Tom from SWISCO responded:

Great! We appreciate the business, it means a lot. Please feel free to reach out if you needed anything else.

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