VS Series II had the getrag box and series one had the T5, so yes, it will bolt up.
the pedal box will go in too as VN - VS Series one ran the cable clutch.
Just for the love of god make sure you get a manual wiring harness and computer. Don't let anyone fool you about a chip to trick the auto comp to run a manual. Nothing but dramas.
The T5 box is stronger than the getrags anyway.
You can use the flywheel aslong as it's a 8bolt and not a 6bolt from a VN Series one motor. Just make sure when you do the conversion to have the flywheel mirror balanced to your current flexplate and the pressure plate zero balanced.
You can also use a VR manual wiring harness with a VR manual ecu and remove the MAF and change a knock sensor too a vr one. But the wiring harnesses and ecu's are rare as ****, so good luck.
You will need the starter from a manual, tailshaft, x-member, console surround... spigot bush ( buy a new one though ) , and replace the little rubber tangs that go onto the clutch fork to hold the throwout bearing in too.. Holden still sell the spigot bush and rubber tangs pretty cheap.
You will need to bridge 2 wires together for the inhibitor switch so it thinks it's in P to start the car, the reverse lights need to be wired from just above the ECU over to the same plug the inhibitor switch use to plug into for the reverse lights. Pretty simple.