Just depends on what sort of job you want done i guess...
If you dont care about Looks/space and you don't want to spend much. Then they'll just fasten in it the box that it came in.
But if you want u can get a custom install, so they make a nice box that fits over the hump in the back of VS. Aswell as say mounting the amp in the flipdown chair, so u can controll the Amp from within the car.
But best idea i think, put the sub in the boot, move it round to see where you would like to put it, then take your idea's to Autobarn/strathfield or w/e
MR T.: I pitty tha fool who doesn't drive a commodore
Ride: 2000 Series I V6 VX Berlina.