I found this bolt under the front right side of my 2011 Mazda 3 2.5 hatchback in my garage today. It has the markings "307A CS" on it, and is about 1" long. I couldn't seem to find any matching bolts anywhere in the engine bay or under the car, and I'm still wondering if it's even from my car. My garage is spotless, so I doubt it's from anywhere else. Thanks for any help in identifying it! Otherwise, I'll be heading down to the dealership on Monday.