Looking for this Milguard window balancer

Hello, thank you for posting,

If the top attachment is winged out like the bottom, with this combination of attachments, you could have either an S380 or S385 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. 

You will need a 24" balance with a 2340 stamp option. Please review and let us know if you have any additional questions. 

Comparison of the S378, S380 and S385 balance shoes.