Greetings, Robert! I confess I am not knowledgeable enough to discern the difference between a stock case and an aftermarket one labeled "Moto Guzzi". Since I am not the first owner of the bike life is full of surprises! Just curious, aside from parts diagrams, do you have a good reference source where I could compare my cases and, for that matter, various other parts, with what is known to be stock equipment circa 2014? The more I find out about my bike the better.