Vauxhall ASTRA Owner's Manual page 344

Installation dimensions
of trailer towing equipment
with detachable coupling ball
1)
bar, Hatchback
All dimensions refer to factory-fitted
towing equipment.
Dimension mm
A 342.9
83
B
513.4
C
488.6
D
211.4
E
94.3
F
160
G
9
Warning
Only use towing equipment approved for
your vehicle. We recommend entrusting
retro-fitting of towing equipment to your
Vauxhall Authorised Repairer.
1)
Do not mount towing equipment to vehicles
with Z 20 LEH engine. Sales designation –
see page 308.
Technical data 339