Channel balace bus no 2630????

Thanks for posting. It looks like you have either our S351-27 or S390-27 channel balance. The difference between the series 351 and series 390 balance lies in the shoe.

Comparison of the S351 and S390 balance shoes.

The series 351 channel balance has the 15-002 shoe while the series 390 channel balance has the 15-001 shoe. The 15-001 shoe is 1/8" larger from front to back. Once you have determined your series, you'll want to select spring strength option 2630. Let us know if you have other questions.