Amsco window

Hey there,

Thanks for reaching out!  It looks like you have either the S380-33 with a 1" shoe or the S385-33 with a 1-3/32" shoe. To determine which series is needed for your window, look over the dimensions from the diagram below to confirm the depth of your bottom shoe. Let me know if it does not match either measurement.

You'll need to select the 3230 stamp.

Comparison of the S380 and S385 balance shoes.

I'm happy to help! The hardware you are searching for at the top corner of the sash is referred to as a top sash guide. It helps to guide the balance in the channel when opening and closing the window and it prevents the balance from shooting out of the window. 

Yours appears to be our 18-008. Take a look over the dimensions below to confirm that this is the right replacement. 

Detail of 18-008

Alternate view of 18-008