Thats a hard one mate, the only way I know others have got through is by drilling a hole. You may also be able to remove a blank bung for a throttle cable and run it through there what.. . I know the Astra has one some place to the drivers side notsure.gif . Drilling a hole ain't to bad, take the glove box out, drill a hole from the engine bay area into the glovebox area or from inside the glovebox area and out. Use a fine small drill first just incase your too far down 😛