Ooooh another good thing i should add, I did this with loweart http://forum.liberty.asn.au/memberlist.php?mode=viewprofile&u=1134 help ages ago when i installed the HU with the stock speakers. 
he suggested making a wiring harness for the HU as well as the speakers. Super cheap auto $10 bucks, then solder and heat shrink the connections here!
Easily the BEST idea ever, it means that when you remove the HU for any reason it takes 5 seconds to do. then hooking it back in takes 5 seconds again. Same withthe speakers under the seat. Best idea EVER! Saved me HOURS!
			
		