Hi all. Just starting to restore my first car and will no doubt have lots of questions as I proceed. First one is about a plastic bottle in the rear quarter panel behind the driver's side roll bar. It's behind a metal cover plate and appears to be a 1/2 gallon overflow for the fuel system. I'm asking because sometime back when the car was near new (before me), a fire extinguisher was mounted on the cover plate and three holes drilled for screws, two of which pierced the tank. I'll know more once I get the car more apart, but I couldn't find anything on this bottle in the original manual. Anybody know what it is? Thanks
John
John