Identifying Correct Part

A home owner from Plymouth, MI says:
May 2, 2021
The pictures are of a 31" Block and Tackle Balance (non-tilt). The stamp pictured says...

(02/05) UNIQUE 30-C-30

I have a number of these I need to replace. I am not sure if they are all the same size. For bulk discount, do they all need to be the same size?

Thank you for any information you can provide.

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Tom from SWISCO responded:
May 6, 2021

Thanks for your photos. Based on what I see here, you have either our S351-31 or S390-31, 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.
A home owner from Plymouth, MI says:
May 6, 2021
Thank you. It looks like I need the S351. I appreciate your support.
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