Paint came from here:
2009 Nissan 370Z Colors of Touch Up Paint
The backplate that comes with the EVO-R emblems is ok but a bit weak so gurneyeagle made different ones. The main thing with these emblems are you have to grind down the 2 bumps so they become smooth.
The ones you linked to are nice and probably do not required any extra work. Just remove the Nissan ones, clean up the glue and put on.