Depending on the model year and body type of the attachment points are slightly different.
Front bumper
To remove the front bumper need to Unscrew the two screws that secure the amplifier bumper to the body. Remove the screws in the wheel arches (if any). Then the assistant pulls the bumper forward (look for wires) from the rails in the wings. Releasable connectors of the wiring harness (if any).
Rear bumper
From the trunk, Unscrew the four nuts that secure the amplifier bumper to the body. Unscrew the screws in the wheel arches (if any). Pulls the bumper back from the rails in the wings and release the connectors of the wiring harness (if any).
How to remove front and rear bumper Saab 900 (1993-1998)