It's common enough that TiAL has a page devoted to helping you spot fakes:
http://www.tialsport.com/realvsfake.html
Honestly from the pictures it looks like MVS fakes are hard to spot... But I can definitely tell that the seats provided with the fakes they have pictured there are made from the wrong metal. That's a dead giveaway. Also the clamps look slightly different at the hinge point.