PLUGS Unknown besides the interior fuse box

Hello everyone! My name is Alex, I bought a Mitsubish 3000 GT VR4 1992 ( Japan made ) in 2016 but up to today September 2023 don’t know what are those plugs are in the picture below. They are right beside interior fuse box. May some one knows what they are for? And where they should be plugged ?
I thank you very much for any help

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