Coil Balance Replacement help

A quick learner from Voorhees NJ says:
Can you let me know which coil balance will replace the one in the picture? Thank you.
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Bob from SWISCO responded:

See our 15-180 Pivot Shoe. This is compatible with the Series 190 Coil Springs. You will need to search the coil springs themselves for stamped numbers that will indicate the spring weights you need. If there are no stamped numbers, give us the exact weight of your window sash, and we'll work out what you need. 

For the record, it's conceivable you could replace this balance system with our Series 140 Coil Balance system; but we typically recommend sticking with what the series you originally had. It's just the safer way to go in most cases.

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