The first accessory we are going to put on the car is the front fender. This is easily acheived with a box. Create a box in front of the car and delete the polys at each end.
Inset the back poly as shown and then delete the two polys outlined in green.
Move the vertices out to line up with the edge of the box and then extrude the red polygon inwards as shown. Delete the polys at the ends.
