Powerflex Polyurethane Bush kit for Vauxhall / Opel Calibra (1989-1997) Rear Trailing Arm Bush - PFR80-440BLK - If you do not require geometry adjustment of the rear trailing arms, then you would need to purchase 4 x PFR80-440's. - Bush Size: - PRICE IS PER CAR KIT, NOT per bush. Powerflex usually price their bushes singly, but we have combined the QTY and price to keep it simple for you!