Channel balance identification

A quick learner from USA says:
I am having a problem determining what window channel balance I need. The top part is 19-002 but the bottom is either 15-001 or 15-002. There appears only to be a slight measurement difference of 1" or 1 1/8" in one dimension between the two items. My part measures 1 1/16". The length is 34" and on the channel it has 33 4 stamped and BSI. Please indicate which part you think is best. Series 390 or 351?
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Tom from SWISCO responded:
That's correct, the only difference is the depth of the shoe. Make sure to account for wear in your measurements. After many years of use, the shoe tends to wear a little, which may make the depth a little less than what it once was. In your case, it may have once been 1-1/8" and simply wore down to 1-1/16".
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