Can't determine part number needed due to bottom foot

A home owner from Melbourne, FL says:
Unique 28-B-20 is the marking on the balancer. Milestone single hung series 1000 windows. The bottom foot appears to be 7/8", but the only two choices I see are 1" and 1.xx". It also looks a little different than the picture. What would be the part number I would need? Or do none of these work for my windows? The top foot is measured with the yellow tape, the bottom with the clear blue ruler. Thanks!
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Bob from SWISCO responded:

We don't carry stock balances that use a 7/8" deep shoe (our 15-029 ), but we can provide them for you via custom order. How many of these balances do you need? From there I'll write up a quote for you. 

A home owner from Melbourne, FL says:
Let me try just two to make sure they work before I buy too many.
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Bob from SWISCO responded:

I just sent you an email with a custom link to order (2) 29" balances with the 19-005 Top and 15-029 Bottom attached. They will be stamped 2820, which indicates they are meant to support a sash in the weight range of 12 through 16 pounds. Let me know if this all sounds right, or if you have any other questions prior to placing your order.

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