Paul from SWISCO responded:
June 29, 2016
Sure, we're always happy to help. From your photos, the pivot shoe looks like our 15-210, which in turn uses the 26-272 pivot bar. See what you think. We don't have this exact balance, but I think our S770-30 should work the same way. It just has a different style clip at the end. You might want to weigh your sash to confirm the proper spring strength option. I'm leaning towards the 30C option, which can carry sashes that weight 19 through 24 pounds, but you should check just to make sure.
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