a genuine one will fit, but wont line up 100% with the front bumper and headlights, your best bet to to get a aftermarket fibreglass one, or if you want to go to the effort, mould some scoops into your factory metal bonnet
Try these guys,when i get the money i going to get one for the clubby.
monaro bonnet vz commodore
monaro style bonnet to suit vz commodore sedan,ute or wagon
Fibreglass monaro style bonnet with smooth show quality finish on the inside. Uses all original factory mounting points for a hassle free installation.The bonnet is also available in steel with the monaro scoops made in fibreglass and grafted on.Comes with 12 months warranty on workmanship. Click Here for Current Pricing on this product
last year when a roo hit me car. i thought good chance to fit a genuine GTO bonnet. so paid the extra for the panel beater to fit it. 2 days later had a call from panel beaters to come and have a look as it doesnt line up. from a distance the car looked good, but closer up the bonnet not lined up across the grille and even the top edge of headlights were showing.the bonnet strip on a HSV woudnt even cover it. then the inch or so material missing from the front was about the same amount excess near the wipers/top edge of bonnnet as it wont match up with top edge of side guards.then was informed after fitting VX plastic wiper surrounds (needed to fit a older bonnet shape) there was a gap either side there too and lil trim edging had to be made and painted.
so i said F**k IT put the original VZ bonnet back on.