+1 to that.
Putting GT lowering springs on your car may lower the rear but probably wont lower the front much. I've seen guys put GT500 springs on their 4.0's and it actually 'lifts' the front end.
But yes, technically they will fit.
Black 2005 Mustang v6, 5 speed, IUP, EUP and Leather.
Razzi 1/4 window scoops, Mustang GT Sway Bars, Flowmaster American Thunder Single Exhaust, Clear Front Turn Signal Lenses, Demolet CAI, X-cal2 91 tune, Hurst Comp/Plus Shifter, FRPP T-Lock, Ford 3.73 gears