Opel GT Owner's Manual page 183

Dimensions
O verall length (mm)
O verall w id th (m m)
O verall w id th including exterior m irrors (mm)
O verall height with soft top raised (mm)
Wheelb ase (mm)
Track w idth (m m):
Front
Rear
Turning c ircle diam eter, kerb to kerb (m)
Technical data 183
4100
1813
1846
1276
2415
1543
1561
10.5