If you are in sydney, then i suggest you go to marty.. Whos marty.. well the guy who posted above me lol (FHRX) hhehe..
Anyways if got two 10 inch subs, then you might have some trouble mounting them above the fuel pump..
You will be able to squeeze your amp in there tho!!
Or you can always take your space saver out and you gotyour self more room..