Seems I recall something about them being a problem, and CL and AC each saying it was the other's issue. . . .
For anyone else who has fitment issues . . . .
I had to sharpen the 90 degree bend on the side plate tabs where they go under the screen, and also slot the holes so they slide in further for more side clearance.
Then I had to slot the holes in the flex bay brackets, to have more than one A6 align with the next one, as the A6 is also a bit higher than spec . .
Overall a major pain, but it's done now and they go in and out smooth as silk.