1991 alfa romeo factory radio removal ?

This may help.  It comes from an Alfa repair web site:

1. Remove the screw that secures the trim to the left of the radio and A.C. panel.
2. Remove both carpeted tunnel trim pieces, (it may be necessary to loosen the front inner bolt on the passenger seat to swing the black metal tab out of the way).
3. Remove the air duct tubes.
4. Working from the left side, remove the phillips screw for the radio wedge. With a 10 mm. and an 8 mm. wrench remove the ground strap and mounting screw at the rear of the radio. Unplug the wiring and antenna. Remove the radio.