31-5 KF5 CMC 54

Hey there,

Thanks for reaching out! Your balances are either the S380-32 with a 1" shoe or the S385-32 with a 1-3/32" shoe. Although, there is a chance that it could measure 7/8". If so, please let me know as these will need to be a custom assembly. 

You'll need to select the 3150 Stamp option.

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.

Comparison of the S378, S380 and S385 balance shoes.