Need a New Channel balance and Black Component

Thanks for your photos, they're a huge help. Based on what I see here, you have either our S351-33 or S390-33, 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. I'll share them below.

As for the black piece, that's called a "top sash guide." Your analysis is correct: these hold the channel balance in place while the window operates. Without it, the balance would shoot up to the top of the window track. Yours in particular appears to be a good match for our 18-019, but it will also come down to size. I'll go ahead and share those, as well.

Please feel free to reach out if I can be of any further assistance!

Comparison of the S351 and S390 balance shoes.

Detail of 18-019

Profile view of 18-019