estimate for custom balance

A quick learner from 32968 says:
I need to replace single hung, non-tilt ,block and tackle window sash balances. Old part has 2940 BS1 stamped on it. Channel width 1/2", length of metal 30",channel depth 5/8". Both top and bottom shoes are winged. Your series 380 has the correct top shoe (19-005) but my old bottom winged shoe only has a depth of 7/8" (needing part #15-029). I have also identified that my top sash guide is a 5/8" sash guide by Norandex (your product code 18-161). Please provide estimate for 2 balances. Thanks.
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Tom from SWISCO responded:

You got it! We can definitely supply this to you as a custom order, it's a pretty simple procedure. I'll email you a purchase link and price quote for two balances made to these specifications. You can use that to place an order on our site.

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