Channel balance and retainer
Thanks for reaching out! I am confident we can supply you with the replacement channel balance you need but to identify the right replacement, I'll need to see a clear photo of the bottom plastic attachment.
The plastic piece at the top corner of the window is called a top sash guide. The guide typically used in PGT windows is the 18-015 PGT Top Sash Guide but to be sure that this is the right replacement, you'll need to find an existing guide and compare the dimensions below. If this is not the correct fit, I'll need to see a photo of your top sash guide to identify the right one.
Thanks for providing the photos. Your balances appear to be the S395-30 with a winged top guide and wingless bottom shoe. You'll need to select the 2940 stamp option.
thanks again!
I'm happy to help and to hear that you were satisfied with the process! Please don't hesitate to reach out with any other hardware repair projects you might have.
Have a great day!