Step 1:
The ventilation grille is removed from the T3.
Step 2:
The ventilation grille is inserted into the Bulli scoop and glued.
Step 3:
The ventilation grille and the Bulli scoop are connected with blind rivets.
Step 4:
The ventilation grille and the Bulli scoop are bolted to the T3.
Upon purchase, I will of course provide detailed mounting instructions.