Headlights yes, grill no.
the 05-07 grill's are taller then pre 05, you can cut it but i think it will look like booty. to do this without cutting you will need to purchase these 05-07 parts...
-lower bumper - metal
-upper part of bumper - plastic
-bumper brackets - 4
-headlights - will need to get the 05-07 bulb connector from ford or wrecked veh. "your stock 03 wiring will not connect to 05 bulb and 03 bulb will not fit in 05 headlamp.
-grill and headlight support - this is behind grill / headlights it has the mounting holes for these.
Hope this helps, mine is a 2002 below you can see my setup.