Replacement Channel Balance

Question

There are too many variations of these things and I can't tell for sure which type I have based on the photos you displayed.
I think these windows are at least 25 years old. House was built in 2001 but I can't say if these are the original windows.
Anyway, the ink stamp on the back is "29 5 BU CMC 2". No other markings. Note that the lower pulleys are not all the same diameter. I'm pretty sure that has no bearing on replacement channels.
Appreciate the help.
Bruce

Bob · Accepted Answer

Hey Bruce. Check out the S380-30 or S385-30 Channel Balances. Depending on the shoe depth (see below), one of these may be what you seek. For a stamp option choose 2950.

Comparison of the S378, S380 and S385 balance shoes.