@FinnN
WAPJ Spirit in the Sky states that VF-31 used the F-4J from 1968 to early 1981; the picture is of 3769/101 in overall light (LGG) gray with a gray rudder and the tomcat without ring or background colour.
C&M17 shows 157308/107 in LGG/White from USS Saratoga with the tomcat on a coloured disc (b&w photo) with no intake fairings. there's also a colour photo of 153809/107 with a yellow disc for the tomcat and in LGG/white with intake fairings.
There's also the CAG bird no bu no./modex 100 in overall gray, intake fairings, the tomcat with no background and coloured ticks on the rudder.
There seems to be a mix of a/c with and without the last four digits of the bu no. being repeated on the rear fuselage.