you need one of those star sockets, i blame the french. if your really really really lucky you can take the bolts off with the socket at a set of plyers rather then having to take whole injection rail off (or buy a tiny ratchet if you got money. lol)
its a torx screw, they are actually a very good design. maxiumum grip ont he screw or bolt. anyway, i have no idea what size. i have used a T27 for the door locks and a T20 for interior fittings, so it could be one of those.