Sash counterbalance part id

A handy person says:
A counterbalance in one of our vinyl, tilt out windows broke recently. The dimensions of the balance are 2.5" tall, 3/4" wide and 1/5" deep. The spring, which broke, on the counterbalance has either a 6z or z9 ID on it. Do you have any idea if I may buy a replacement part. Thank you so much for your help.
User submitted photos of a coil window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. The housing looks like our 15-087. Do you agree? If so, I'd also recommend our Series 180 coil spring.
A quick learner says:
Thank you for the reply. Can you tell me how to choose the coil weight?
Tessa Barsic
Profile picture of Tom
Tom from SWISCO responded:
Sure, you simply have to match up the number printed on your coil with the options we have listed for this Series.
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