Adjust vertices and then chamfer edges. Create a small cylinder and position it in the box you just made and that will be the screw. This is a what the finished headlight looks like.
Next is the light below the headlight. Create an 8 sided cylinder a shown and position it inside the cavity in car as shown.
Extrude the side polys outwards
Select the polys shown and inset them by about 1 or so.
3DTotal
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Target Weld the red vertices onto the corresponding g.