Spiral balance help

A quick learner from US says:
New single hung wood window, bottom sash 42" long, weight of 40 lbs, do you have what I need. Thank you, Norman
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Full name: Norman Berry
Spiral series: S500
Spiral length: 42
Quantity: 2

Sorry no photos but it is a new window with a 5/8+ Rounded channel centre routed in both sides of the sash. The sash length is 42". The bottom has a square cut out for the holding bracket, which I will also need. The sash is 40 pounds.
Profile picture of Casey
Casey from SWISCO responded:

Hello,

We just sent over a custom order link for two S500-42 spiral balances with black tips to support your 40-pound sash. You'll also need brackets like our 17-012 to anchor the balances to the bottom of the sash. Thanks for posting!

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