ECN Forum Forums General Topics of the Trade General Discussion Area Attaching and extra ground buss bar

I'm installing an extra ground bar into a 200A Cutler Hammer panel. There are no threaded holes to attached the ground bar. Does anybody know if: 1) Can use a screw and attach the bar by screwing through the panel and into the wood behind the panel. 2) Do I have to use a Cutler Hammer Buss bar, or will any manufacturer work. 3)Is there a requirement to have an insulator behind the ground buss bar? Thanks - KD