Welcome to the site.
To answer your question ... the G-1 was a quite late variant based on the D-3 variant. All later Ju-87 are said to have the fuselage interior finished in the RLM66. The external surface were painted with the RLM 70/71 on tops and the RLM65 on undersides. However the late RLM65 was quite close to the RLM76 used for undersides of the Luftwaffe kites. So you may find the one too. Certainly there could be exceptions depending on the time or TO. Therefore it would be helpful if you had a picture of the particular plane .