As the 6 series is slightly higher, we need to make a little space on the plastic holder which is beneath the card.

Remove the plastic part, which is shown on the 2nd picture, by removing one screw and carefully pull it from the aluminium case.

It's fastened with tape so don't worry about breaking anything.

After wiggling and navigating it around the cables, you should have it in your hands.

The rectangular space, in picture three where the large cable goes through, use a rotary tool to make it about 5mm wider and 2-3mm deeper.

The third image shows the final result we want to achieve.

The primary reason for this step is the heatpipe of the 6 series, which takes more space.