Tom from SWISCO responded:
January 10, 2013
Hey, Sam, thanks for getting in touch with us. The difference between the shoes for the Series 351 and Series 390 has more to do with their sizes than their colors. These Series use our 15-002 and 15-001, respectively, each of which have a different depth. Take a look at the image below to see the difference and let me know which one is closer to what you have.
Comparison of 15-001 & 15-002
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