As a German living in Germany, I join in the question “Where did they all go?”. Even in Germany you won`t find many Opel Kadetts “A-D”, the D-Kadett was built until 1984, being regularly driven anymore. Even at classic car shows that my wife and me attend with our cars you are sure to see at least about 30 vintage Porsche 911 or Mercedes SL for every Opel Kadett oder rear-wheel-drive (built until 1980) Ford Escort.
From the late 1930s to the 1980s, terms from the German Navy (Kapitän, Admiral, Kadett) and from other official sectors (Diplomat, Senator) were often used as model names. Since the late 1980s, the model names of Opel passenger cars end with an a. As Opels were no longer being sold in Great Britain, no need remained to have separate model names for essentially identical Vauxhall and Opel cars (although some exceptions were made to suit the British market). The last series to be renamed across the two companies was the Opel Kadett, being the only Opel to take the name of its Vauxhall counterpart, as Opel Astra. Although only two generations of Astra were built prior to the 1991 model, the new car was referred to across Europe as the Astra F, referring to its Kadett lineage. Until 1993, the Opel Corsa was known as the Vauxhall Nova in Great Britain, as Vauxhall had initially felt that Corsa sounded too much like "coarse", and would not catch on.
On the British motoring show Top Gear, Richard Hammond drove a 1963 Kadett A through the middle of Botswana and across the Makgadikgadi Salt Pan. He loved the car so much that he named it Oliver and later had the car shipped to the United Kingdom and restored, and it remains in his possession. It appeared on Richard Hammond's Blast Lab with the personalised number plate 'OL1 V3R'. It also appeared in the Top Gear lorry challenge as one of the used obstacles.
The next step for Opel was the resumption of passenger car production. It might have seemed easiest to bring back the Kapitän first since its engine was already in production for the truck, but occupation regulations restricted German civilians to cars of 1.5 L or less, which made the Olympia the obvious candidate. Under Dr Ing e.h. Karl Stief, who had been chief engineer at Opel since 1934, useful changes were made to this tough little car. The Dubonnet front suspension was replaced by a conventional coil-and-wishbone layout and the steering was correspondingly rearranged.
the Chevy Chevette, while a MUCH better car than the Vega was at the time, and even now, that’s not saying a whole lot, other than it WAS infinitely more durable and longer lasting and reliable than the Vega, though by ’76, the Vega was decent enough, but the damage was done. I know as my Mom drove a ’76 Vega from roughly 78-83 with the only major thing being the carb being rebuilt around 1980. The Chevette was basically a redesigned Kadett/Vauxhaul Chevette.