The items that fit your Volvo XC90 1st gen are shown below.

Aerial/ Antenna Connection

On some Volvo XC90 models, there is no antenna connector behind the radio, it is in the roof at the rear of the car. If this is the case you will need to remove the rear roof lining and locate the cars antenna system and run a antenna adapter extension cable 21-148 along the left side of the roof trim.

If your Volvo XC90 already has an antenna connection behind the car radio then this part is not needed.