Window has no balances to measure.

Thank you for posting. It's hard to say what balances you need without any of the originals on hand. Would you happen to have an identical window elsewhere in the house that still has all its hardware? Otherwise, the best we can do is guess.

You could look at our S390-26 channel balance. This may fit in your channel, but again I cannot guarantee that it will work. You can weigh your window sash to determine what stamp option to use.

Looks like you only sent pictures of the top attachment. We need to see the top and bottom to be sure. Your best bet is to simply compare the specs we show for the S390-26 to your own balance. If they differ in any way, let me know exactly how.