Ah, ok, I seeeee....
So they came with a 2678-2 in a movement ring, and you've swapped this arrangement out for a 2836 (without a movement ring?).
I guess that as long as the sweep is smooth and the movement genuine, as advertised, I wouldn't mind which was in mine, but the overall best option would be a 2824-2 movement and the case from the LV with the correctly placed stem hole?