Depending on the model year and body type of attachment are different.

Front bumper

 

-open the hood.

-under the hood, take out the clips and remove the trim above the grille.

-under the pickguard, Unscrew the screws, release the clips and remove the grille.

-Unscrew the screws behind the grille.

-Unscrew the screws around the perimeter of the bottom.

-wheel arches Unscrew the screws that attach the fender liner.

-release the fasteners of the corners of the bumper to the wings.

-pulls the bumper forward.

mounting points for the front bumper Alfa Romeo 145 (146)

radiator grill mounting scheme Alfa Romeo 145 (146)

front bumper mounting scheme Alfa Romeo 145 (146)

Rear bumper

 

-open the trunk lid.

-in the opening of the trunk, Unscrew the screws.

-Unscrew the screws around the perimeter of the bottom.

-Unscrew the screws in the wheel arches that secure the fender liner.

-Unscrew the screws holding the corners of the bumper to the wings.

mounting points for the rear bumper Alfa Romeo 145 (146)

rear bumper mounting scheme Alfa Romeo 145 (146)