Need a part ID

A handy person from Colorado says:
32-4 BH5 CMC 75
Metal channel is 33" long not including the plastic ends
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Tom from SWISCO responded:

Based on your photos, you have either our S380-33 or S385-33. The only difference between them is the size of the bottom fitting, which is indicated on their respective store pages. You'll need to measure your bottom fitting to confirm which one is the better match.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
A handy person from Colorado says:
Do I have to order one of the required options, if yes which one, if not how do I do it if it is required?
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Casey from SWISCO responded:

Based on your balance stamp code, you would need a 3240 strength option for either the S380-33 or S385-33 channel balance. Thank you!

A handy person from Colorado says:
Thanks for the info. I have placed my order! Great customer experience.
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