Ijn Gray Sub.

I am looking for a substitute for Ijn Gray. I have never heard of this color but apparently Tamiya makes it. If I want it I will need to order it off the net. I don't really wanna wait a week for a paint im gonna use a few times on some small parts. So does anyone have some color ideas that I can use instead or a mix of colors I can use? I need it for my Hobby craft F4F Wildcat.

Thanks