This is a Rear eccentric bush that allows adjustment of the trailing arm geometry for lowered vehicles. If fitting these, order 2 x PFR80-440BLK's and 2 x PFR80-440MLK-BLK's.
PFR80-440MLK-BLK
Vauxhall / Opel Cavalier GSi/Calibra 4WD, Vectra A (1989-1995) Rear Trailing Arm Bush