Need new window part

Thanks for posting. I think you'll want to look at either our S380-30 or our S385-30 channel balance.The difference between the Series 380 and Series 385 balance lies in the shoe.

Comparison of the S378, S380 and S385 balance shoes.

The series 385 balance has the 15-004 shoe which is slightly larger from front to back, as illustrated. Once you have determined which series you need, you'll want to weigh your sash and use the sash weight range/stamp option chart pictured beneath your balance to choose the correct stamp option.