Searching for Lo2 27 hd

Hello there!

Thank you for reaching out to us. I'm afraid we aren't able to identify your hardware from these photos alone. We'll need to see an undamaged balance removed from the window including any attachments that go with it.

Thanks for the additional photos! This is a huge help. Our S751-28 appears to be a match. However, it's odd that both of your balances have different stamps; they should be the same. With that said, we recommend you weigh the sash on a scale to determine the proper strength option. There's a chart under the product description on the S751-28 store page that will tell you which option is best based on the sash weight.