Identify a window part

A home owner from USA says:
June 20, 2016
Can you identify the non-tilt window spiral balance? It was from a window build in 1994. The metal casing is 5/8 inches thick and 30 inches long. The spring is about 17 5/8 inches long. It has "f 2910" imprinted on the metal. A piece of plastic broke off the top of the spiral balance. I assume I should replace the whole part and not just the plastic piece.
User submitted image of their window hardware.
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Tom from SWISCO responded:
June 21, 2016
Thank you for posting. Take a look at the top guide 18-161 to see if that matches up to your guide. As for the balances you could have either the S380-30 or the S385-30 with the 2910 option. Check the measurements of the bottom shoe on your balance. Specifically, take the measurements from the "heel to toe" to see which balance shoe matches up to yours.
5/8" Sash Guide, Norandex
5/8" Sash Guide, Norandex
18-161
$1.88
30" Series 380 Channel Balance
30" Series 380 Channel Balance
S380-30
$11.30
30" Series 385 Channel Balance
30" Series 385 Channel Balance
S385-30
$11.30
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