appropriate coil balance

A home owner from Bloomington, IN says:
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?
User submitted photos of a coil window balance.
Profile picture of Paul
Paul from SWISCO responded:
That pivot shoe resembles our 15-180. Do you agree? If so, see our S190-840 coil spring, as well.
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