can anyone tell me what to do if one of the fender mounting nuts lets go and drops inside the rear 1/4 panel????
Err, bummer - first thing I'd do is swear.
On a beetle you can get to some of them from the inside of the car by just taking the trim card out, so you might be able to get the fallen nut out
with a magnet and then just fit a standard nut on the end of that bolt.
yeppas should be able to get at it through the side panels, depending where it is etc would depend if you will even bother putting that extra nut on