For what? When you get the lights from walmart they come in a longer 12" strip i wanted the lights spread out around the trunk area a little more so i cut them into 3 LED sections. If you do this you have to solder them back together.
You may find a plug on e-bay that you can push into the rear trunk socket and then poke the wires into from there.
I created my own plug because i didnt want to cut and splice the stock setup incase i wanted to put it all back how it was stock. Back seats back in, back panel and stock bulb. It was cleaner and easier IMO.
DX3?.. huh?.. well ZX3 = Zetec the 05-07 has a Duratec so D