This is the channel that the windows, both front and rear, roll up into to seal them at the top. Don't forget these when you are putting new weatherstrip in your restoration. Danchcuk #628 will work for any 1956-1957 classic Chevy 4-door hardtop. Additional handling and oversized shipping required.
Danchuk has the largest selection of quality 55, 56, 57 parts for your classic Chevy project.