IWC impact window balance replacement

Question

I need to replace the channel balances on our IWC single hung windows. The balance length is 24", 1/2" wide, marked 23 20 DS and I was initially thinking the 377 2320 would work but the top looks more like a 19-041 than a 19-018. Could you advise?
I've attached pictures.

Lauren · Accepted Answer

Hello, thank you for posting,

I agree with your assessment that the top attachment resembles the 19-041. We can custom make this configuration for you via a custom order.

To further review, are you able to confirm the depth of the bottom shoe attachment as shown below?

Comparison of 15-004 and 15-005

Once confirmed, I can send over an order link for purchase. Please advise how many you need as well. Thank you!