Just had a quick look;
HX van "A"
HQ coupe "S"
HZ ute "B"
HZ sedan "S"
WB ute "A"
HX tonner "A"
all have the hole, but I have definately seen some bodies without, so may not be that common?

Got others that I can't get to, or the bonnet being used as work benches. Now I want to find one without the holes