Monson window balances

A handy person from USA says:
Do you guys have any spiral fixed window balancers that are 29 inches long and look like this? I need 13 pairs...Thanks Travis
User submitted a photo of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
I think we can help replace this, but we will need a bit more information. First, can you tell me the length of the inside spiral? You can determine this by pushing the spiral in as far as it can go and simply measuring the whole thing. Once I know that we can work from there.
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