Channel balance identification

A quick learner from USA says:
November 9, 2015
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:
November 10, 2015
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".
34" Series 390 Channel Balance
34" Series 390 Channel Balance
S390-34
$11.73
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