THE OFFICIAL MONOGRAM PAINTING GUIDE TO GERMAN AIRCRAFT 1935-1945 by Merrick & Hitchcock states the following:
"The reissue of L.Dv.521 in November 1941 stipulated that all cockpit areas or crew areas visible through a glazed covering were to be painted Black-Gray 66, principally as an antiglare measure. The remainder of the interior, including weapons bays and undercarriage housings, were to be finished in Green-Gray 02.
I hope that this is of some help.
Pete