Unfortunately, I don't.
The best I could find in my picture stash was this old one I'm sure you've seen about a million times.
Just ignore the color of the outer casing. Isn't this pretty much the same set up used on Phrogs? Generally, I remember the color of the buckets being the same light grey as the fuselage. Also, I remember painting some buckets for our ordinance guys. We just used the same 2 part epoxy primer we used whenever we had to touch up any grey portions of the fuselage or engine cowlings.
My photobucket page has some CH-53E reference pics which you may find helpful.
http://smg.photobucket.com/albums/v491/ridleusmc/
Semper Fi,
Chris