Today I prepped my 1984 t-top mustang for paint. I wanted to order new weatherstripping for my car to give it a really clean look. I am looking at 50resto.com at t-top Weatherstrip kits and there are two options. One says before 10/83 and another says after 10/83. Since my car was first sold in 1983 I feel this applies. Does anyone know what the difference is? Is there any physical signs that will let me know? I would check my door sticker to check the build date, but it is no longer there. Thank you for help!