Need window balances for these.

A quick learner from Stafford va says:
I am trying to find these balances.
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Paul from SWISCO responded:

Hmm... It looks like you have 18-124P top sash guides. You will need to replace if broken. Typically these are used with the Series 371 balance. Please remove one and compare to see if the fittings match your own. If the Series 371 looks correct, go with item S371-28 and choose stamp 2740.

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