Hey tango,
For some reason FS 36081(gray) and 36440(flt gull gray) stand out for some reason.
I would go w/ a medium gray. Sorry at the moment my references are not in hand to give ya a more accurate answer.
Check this site out as well.
http://www.f-15estrikeeagle.com/reference/cockpit/cockpit.htm
Flaps up, Mike
If you would listen to everybody about the inaccuracies, most of the kits on your shelf would not have been built Too Close For Guns, Switching To Finger