Need replacement

If you are measuring only the metal channel at 29", then I think you'll want to look at either our S380-29 or our S385-29 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, look for a number printed on the channel that indicates the spring strength. Let us know if you have questions.