Bottom sash dimensions of window is are 30"x32" this is the spring on the side

A contractor from Attleboro, Ma says:
October 26, 2017
Need new spring for bottom sash
Coil assembly
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Paul from SWISCO responded:
November 1, 2017
I'm relatively confident that you need our Series 170 coil spring. You need to select which strength you need among those Series 170 coils. There is a three digit number (stamped on the coil spring) that tells you which one you need.
263 Series 170 Coiled Balance Spring
263 Series 170 Coiled Balance Spring
S170-263
$5.94
CertainTeed Pivot Shoe
CertainTeed Pivot Shoe
15-192
$6.39
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