appropriate coil balance

Question

Hi, I think I need a two 8 lb Series 152 Coil Balances. My window is 27" x 35" single strength insulated glass.
(27 x 35)/144*2.25=14.76/2=7.4

I attached pictures of current balance and window. Can you confirm which Series Coil Balance is right for this window?
Thanks,
Ken

User submitted photos of a coil window balance.

Paul · Accepted Answer

That pivot shoe resembles our 15-180. Do you agree? If so, see our S190-840 coil spring, as well.