As I recall, when I replaced the windshield in a '46 TuDor Sedan I had in the '80's, I assembled the windshield glass, rubber and stainless trim as a unit, and installed it as such. Its best to have at least one helper inside the car and one outside. I used liquid dish soap and some twine to help with the installation. I think I installed the center section stainless after the windshield was in place, and secured it with the corresponding interior center section and interior garnish molding.