I removed the gas tank to check the air filter and noticed this rubber bumper on the floor when I was reinstalling the gas tank and don't know where it came from. I looked all over the tank and frame looking to see if there was another one that didn't fall off. I also looked for witness marks of where it could have been but I don't see any of those either. There are no grooves or mounting holes in it. It's just a perfect rectangle of rubber.