I removed my windshield and the clips a few years ago and preped and painted in the channel. Now I'm getting the new glass installed but can't remember the way the clips went on. There seemed like there were 4 metal clips used at some positions. I did buy a new kit with the plastic ones, but didn't come with any metal ones. Does anyone know the spot the metal ones are supposed to go? Is it necessary to use the metal ones, or just go with the plastic clips?