Hey y'all I'm gathering the parts to replace the OEM head unit in my 2009 Galant SE and I just want to make sure that I have all the parts. It's a two hour drive to pick up the new head unit and I want to make sure I will have everything when I go to pick it up.

I have:
Metra 99-7012 Single or Double DIN Installation Kit
Metra 70-7001 Radio Wiring Harness for Mitsubishi
PIONEER FHX500UI Double-Din Stereo Unit

My question, being a newb is will I need anything else for the installation if I have the Rockford Fosgate system? I've never done this before.