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Hey, Hugo.

It looks like you have either our S351-23, with a 15-002 bottom attachment, or S390-23, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a spring strength option of 2210.

If you have any further questions just let us know! 

Comparison of the S351 and S390 balance shoes.