I found the tray included with the 2.5D iCarez too big for the protector in all directions, so I'm not sure if I I have a defective product or if I'm missing something. The proctector should fit perfectly within the tray, and not able to move up/down and side-to-side.
My observations:
2-pack 2.5d without the tray is slightly smaller than the one that comes with the tray. So if you try to install the older version 2-pack (without tray) using the black guide, the glass will move around within the tray and won’t be a perfect install.
Both versions fit perfectly for me though.