I was just about to edit since I was checking the sporting regs... but now this seems to make even less sense because Art. 39. b clearly says two.
Quote:
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b) Entry in the Championship is for the season, which concerns all the Events registered on the calendar of the said Championship and is limited to two cars per group.
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The pdf is the latest version available from fia.com (Feb 27).
I definitely don't object 3rd, 4th or whatever cars but it's just stupid to have a rule that they have no intention to actually enforce.