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As others have mentioned, the white knurled nut just holds the bezel in place, and I'm missing one. I remember now, that one was broken at the plastic part just after the threaded rod, have glued it back, yet to put on another nut.
The long bolt heads with a slot should be the aiming devices. There should be two each for the headlight and fog light, but I only see three. There is that one bolt at top, second pic, just to the left of the slotted bolt, that may have something to do with it also. First two pics.
The 123's have a different set up. Third pic.
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83 SD
84 CD
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