Guys,

F1 rules state that teams which finished 5th or below in the 2004 F1 Constructors Championship can run 3 cars. Ferrari, Williams, BAR and Renault filled the top 4 positions in 2004 so they are not eligible for this. McLaren had a terrible 2004 (they came 5th) so they are taking full advantage of this concession designed for the weaker teams that are expected to do less well.