Two rivets at the back (with a washer on the other side), and all the piece is glued with flexible poliuretane adhesive (Sikaflex is the name of the product). The front is well held with the four default screws. All my three front plates are broken, but with this system they are alive again (I've only used one and it seems to work... two hard weekends of racing and it has survived every impact)
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