Identifying the right part number for window balance

A contractor from Fort Myers, FL says:
May 3, 2021
I had ordered part S380-29, but I seem to have gotten the bottom shoe incorrect.

The top guide matches, but the bottom shoe appears to be slightly larger (about 1/8th of an inch) with these new balances and thus won't fit in the window.

I realize the 385 series is similar, but from what I read the shoe depth is larger than I need.

I've included the best pics I could to help see the issue.

Can you help identify where I am going wrong?
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Thumbnail of the uploaded file named pic1_oldbalance.jpg
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Bob from SWISCO responded:
May 4, 2021

Sorry to hear the Series 380 did not work for you. Looking at your shoe, I think you might need one with a 7/8" depth, such as our 15-029. Look it over to confirm. Now, none of our stock balances use this shoe, but we can provide balances for you that use it via a custom order. I'm sending you an email with a custom link to order ten(10) 29" balances, stamped 2850, with the 19-005 Top and 15-029 Bottom attached. If that all seems right to you, or if you have any questions, let me know before ordering. 

If you wish to return the Series 380 balances you purchased, see our Return Policy here.
Winged Channel Balance Shoe, 7/8" Depth
Winged Channel Balance Shoe, 7/8" Depth
15-029
$0.82
29" Series 380 Channel Balance
29" Series 380 Channel Balance
S380-29
$11.10
Channel Balance Top, Winged
Channel Balance Top, Winged
19-005
$0.74
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