France may be what you are looking for, because of high taxes on powerful cars, a car such as a Mustang costs more or less 40k€ in which you have to add at least 20k€ of Eco Malus on top of that, meaning that even though there are people that are passionate about cars, it becomes more and more difficult to own such cars.
Also what you have to consider is the ...
I recently purchased several from Dinic.
I've purchased from the same firm before for other adapters, so I have a small collection now, and they're all quite sturdy with excellent tolerances, and yes, grounded.
About 5€ each, before shipping; also on Amazon