1/2" wide channel balance

A quick learner from Arizona says:
I am trying to order 2 and I can't tell the difference between a bottom 15-005 and 15-004.

The length is 21" and the top appears to be 19-005.

The markings on it are 20S 28
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Tom from SWISCO responded:
The difference lies in their size, specifically their depth. Please carefully compare their dimensions to your own hardware and see which is a better match.
15-004 and 15-005
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