window channels - pics attached

Thanks for reaching out to us. Does the bottom fitting measure 1-3/32" deep? If it does then I think the Series 385 is a good match. However, keep in mind that we also sell the Series 380 which has a 1" deep shoe. I also recommend the 3130 stamp option based on the 31 3 printed on the metal channel.

Comparison of the S380 and S385 balance shoes.

The stamp printed on the metal channel represents the weight range the balance is designed to support. For example, the 3110 stamp option is calibrated for a window sash weighing 7 to 12 pounds.