My G5 has 190k miles on it and I have 0 signs of damage to the firewall; I also live in a Snow area. As for mounting it, it sits in a notch. To remove/replace it you need to turn it clockwise 90* then it should pop out. Then you remove the connection at the pedal. Found this on CobaltSS.net Mod Plate for Clutch Master . Apparently it does happen. They describe something called a "Mod Plate" which contains said mounting bracket.