A few years ago I sold my Ferret to a German buyer, he arrived from Germany with his car and a 9 inch grinder with a supply of thin blades, Cut out 2 letterbox slots ,one where the Driver sits and one near the radiator, He had the drawing from the Officials of where to cut.
He then put the 2 letterbox bits in his car :-D (well he had paid in total!) and went back to Germany.
Lorry arrives and that was the last I saw of it.
Things may well have changed since then but that is what happened at that time.