Does anyone know what color is used for the "grey" section of the mock diffuser on this bumper?

I am going to EvoDave for rear light mods...I want to do a JDM Evo 8 style, but have the "background" matched to the grey lower center section of my bumper instead of black.

 

Eisen Grey, same color as the MR vortex gen. and wing

 

Thanks!