Identifying paint color on FX20D

[Semper Fly]

I'm painting my FX20D and have everything I need except the (gray??) for the lower engine side panels, the panels that have the clips used to hold/ release the engine covers. Can anyone give me a description/ manufacturer for this paint? It's the only color used on this model body other than the basic red and Off-white.

Mine is so faded I don't know where to start looking.