Asking as a favour for a friend. He has a 2000 (W reg) Astra 1.8 SXi he's been asked to put a new gearbox in. It was delivered to him gearbox-less, and he's struggling to find out which box should be in the car. What's making the job harder is the fact that it's an imported right hooker Opel, not a Vauxhall. Any ideas what the correct gearbox would be?