CMC 278 coil balance

A home owner from colorado springs says:
September 23, 2017
I'm looking for coil balances for vinyl windows. I've got a bunch of broken ones. The markings on the photo say:

CMC 278
35"
7#

Also, it looks like there are 2 per window side (i.e. 4 total per window), and it appears 1 would go each of these 2 parts:

15-087
15-086

Finally, no cutouts, should I get jamb spreader or make cutouts?

User submitted a photo of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
September 27, 2017
Thanks for posting. The springs compatible with the 15-086 and 15-087 is our Series 180 coil balance. Based on your stamp, I'd recommend the S180-7.

As for whether you should get jamb liners or make cutouts, it's ultimately a matter of personal preference. Both methods work equally well, it just depends on what is easier for you.
Coil Housing Pivot
Coil Housing Pivot
15-087
$5.97
Tandem Coil Housing
Tandem Coil Housing
15-086
$1.68
7 lbs Series 180 Coil Balance
7 lbs Series 180 Coil Balance
S180-07
$4.97
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