I don't think they're 30mm, maybe more like 8, unless they changed things from '95, which is my model year. In any event, once you remove them, you may need to take a rubber hammer to hit the screw studs with, as the rubber gasket around the lens can form quite a tight seal that could make merely pushing it out a bit of a task. Once out, wash the lip and hit with some wax, check for any rust that may have crept in.