Extended-Travel Channel Balance Quote

Thanks for your photos. This is not an extended travel balance, this appears to be a typical configuration. Based on what I see here, you have either our S380-30, S385-30, or S378-30 depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

The only thing I'm unsure about is the stamp. You listed your stamps as being 2920 and 2950. Are these on the same window? If so, someone made a mistake while installing them. They need to be identical.

If that is the case, I suggest weighing your sash on a scale. We have a weight chart on each balance's store page that tells you precisely how much weight our stamp options support. All you have to do is pick the stamp that covers your sash weight. 

Comparison of the S378, S380 and S385 balance shoes.