I printed in white PETG and had some difficulty fitting two of them on my X1C:
- the cover on the bottom — really had to push
- the cover next to the right Z screw. I had to draw on the top to visualize where the tab was and make a mark to line it up, then push firmly. the left one just slid in.
perhaps they have changed the p1s. the plate covers won't fit here.
last image: i tried to move the back cover a bit upside but it is not enough space to get the plate in