Extended-Travel Channel Balance Quote?

Thanks for posting. These actually do not appear to be Extended-Travel balances, but rather standard channel balances. Specifically, you appear to have either our S380-33 or S385-33. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. See the diagram below for reference. For the Top Sash Guides, see our 18-171.

Comparison of the S378, S380 and S385 balance shoes.