Balance parts

A quick learner says:
need both sides
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Casey from SWISCO responded:

Hello,

I'd recommend removing your pivot shoe from the window and comparing the dimensions to our 15-192, which uses the Series 170 and Series 171 coil springs. Thank you!

SWISCO S170 and S171 Coil Balance Assembly
SWISCO S170 and S171 Coil Balance Assembly
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