Channel Balance Replacement

A home owner from new Jersey says:
I need to replace a number of balances, the numbers stamped on the channels are: 2810 BSI, 2830 BSI, and 2440 BSI with a backward C. Having trouble identifying the balance shoes. The top shoe I am confident is a 19-002, however, the bottom shoe could be either a 15-001 (series 390) or 15-005 (series 351). They appear to be the same shoe. Can they be interchangeable?

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Tom from SWISCO responded:
Hey, Doug, thanks for posting. Our Series 351 actually uses our 15-002, not our 15-005. Is that what you meant?

If so, the difference lies in their depth. You will need to measure your own shoes and see which is closer to your own.
Comparison of 15-001 & 15-002
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