replacement for Caldwell 28 4

A quick learner from plano tx says:
June 6, 2020
I need either a S351 or S390. My balance bottom guide measures 1 1/16" which appears to be between the S351 and S390. Should I go with the S351 or S390. My part is marked 28 4 EP Caldwell if that helps
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Tom from SWISCO responded:
June 10, 2020

Your shoe was probably 1-1/8" originally and just wore down overtime. That's more likely than your shoe having gained depth. I recommend the Series 390.
29" Series 351 Channel Balance
29" Series 351 Channel Balance
S351-29
$11.10
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