Vauxhall VECTRA Owner's Manual page 242

Alloy wheels 3 : Prise off the wheel b olt
caps using a screwdriver and rem ov e
them.
240
2. Slac ken wheel b olts using wheel bolt
spanner, p utting wheel bolt spanner on
as far as it will g o.
3. There a re plastic retainers at the front
and rea r of the vehic le underbody for
positioning the jack (marking on side
sills), into which the hea d of the jack
must b e inserted .