coil spring marked with "12"

A quick learner from Ontario says:

I need a replacement parts for my sliding window. It has number 12 on it. I don't see that neither of two LH or RH is broken but window won't stay up.

In the past I ordeered S140-8 L and 8R from you and replace it on my other windows. Now I'm surprised that this window has number 12 on it.Any advice what part I need with number 12

Thanks

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Tom from SWISCO responded:

Hello! If these coil balances are identical to the old S140-8 , except they're marked with 12, then I would recommend the S140-12 . Look over our photos and description and let me know if you have any questions.

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