Channel balancer replacements

A quick learner from Florida says:
My existing channel balancers are for a single hung, non-pivoting window with a sash weight of 47 lbs. They are marked 27 14L.

Top attachment - 19-002
Bottom shoe 15-001
Length 28"
Width 1/2"

Your web site table for this balancer only goes up to 39lbs. Can you make a replacement?
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Tom from SWISCO responded:

Thank you for your patience during this busy holiday season. We can definitely supply this balance but it will have to be a custom order due to that heavy duty spring you have. Before we go any further, can you just tell me how many you need?

Once I have that, I will email you a purchase link and price quote for that quantity.

A quick learner from Florida says:
I need four (4) new balances.
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Tom from SWISCO responded:

Sounds good! I'll shoot that over to you now.

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