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I would go to a parts store and try to find a new one that is similar, and ask the guy at the counter if you can see the hardware packet. They might list the screw sizes in the instructions. Maybe even check some bugshield websites for downloadable info.
Hey yeah that would be the first thing I would've done but I'm living in Germany so no new bug shields to check out locally...
I'm gonna check again some websites that might help.