Hey all. After spending hours searching threads for the (HOLDEN, NOT H@SV) VP IRS to no avail, I decided to give Holdens a ring. To cover themselves, for some reason, required a hard copy of the specifications.
So...here they are...

STEEL WHEELS
Rim width code 6.0JJ 6.0J
Exec V6- 14"
All Berlina and Exec V8- 15"
Max permissible radial runout .6mm .6mm
Max permissible lateral runout .8mm .8mm
Offset 43P 43P

ALLOY WHEELS
Rim width code 6.0J 7.0J(SS MODELS ONLY)
Diam code 15" 15"
Max poss radial r/o
Exec and Berlina sedan 0.25mm 0.25mm
Calais 0.25mm 0.25mm
Max poss lat r/o
Exec and Berlina 0.3mm 0.3mm
Calais 0.3mm 0.3mm
OFFSET 42P 31P