Window sash guides

A home owner from USA says:
It is 30" long but I don't see a color? I need to buy 2 and a tool to install? Please contact me asap as I need to repair immediately.
User submitted a photo of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. I believe we can help replace this, yes. However, it will have to be custom made. I believe you have 3/8" diameter spiral balance a 15-142 shoe. Can you just tell me the weight of the sash that these balances support? That will allow us to calibrate the proper spring strength.
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