Looking for two of these

A friend from 07005 says:
I need two window balance springs for an old window.
Springs as well as the plastic case.
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Paul from SWISCO responded:

Hi! The nylon housing is the 15-103 and the coil balances will be Series 145. You will also need to check the band of the coil spring for a stamped weight code. Let us know if you have any questions!

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