Bf-109 flap detail

Anybody have a clue what color to paint the space between the upper and lower flaps, behind the wing radiators? I’ m not sure if its RLM 66 or RLM 02, can you guys help?

The answer is RLM 02.

Much appreciated.Nice Arado.

i’m not so in aircraft like in panzers but is it or not that rlm 66 is for late models 8 i know sure for cockpit) but flaps and wheel bay I dont have nay idea !???!??!??