Coil Balance Extension?

A home owner from Lafayette, IN says:
I have duel coil balance double hung window with the coil balances located at the top of the frame. My existing balances have 1 with an extension (see pictures)with a label that says 4.5 33". I've ordered the S160 coil balances but still need whatever this is. Please help! Thanks
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Hmm...I don't believe the coil spring manufacturer makes this type of spring. May I see your balance set up in the window track so I can advise you?
A home owner from Lafayette, IN says:
Here's the balance set, I'm thinking of lowering the coils
under the tilt latches and using 2 S160-4 coils. Would that work?
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Yes, I was going to suggest that! Very good analysis. The coil spring manufacturer suggests that, as well.
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