Channel balance

A home owner from Texas says:
July 10, 2017
Looking for confirmation on the style before I place order... length is 29"

Not sure if the top attachment and shoe attachment..

Stamp on the rail looks to be 2830Z. I see online the 2830 is for Sash weight of 16-23 lbs...... not sure what the "Z" at the end is for.
Thanks for your assistance.
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Tom from SWISCO responded:
July 13, 2017
Thanks for posting. Please take a look at our 29" Series 370 balance. Compare your measurements to ours to confirm this. You'll want to select spring strength option 2830.
29" Series 370 Channel Balance
29" Series 370 Channel Balance
S370-29
$11.27
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