. What body style do you have? One ton trucks have top & bottom windshield. Half ton were chassis only and it would depend on what the body maker provided. Landau sedan has flip out windshield. The early and late 1927 Chevy Landaus had different size windows. Coupes and sedans have crank up windshields. Roadsters & touring have 2 piece top & bottom different than ton trucks. Sport cabriolet had flip out windshield. I have included early passenger cars and late Landau. . . Maybe you could send a photo of what you are working on? . . Lou .