Hey Blender fam! If anyone wants the OG color-checker map from Blender as an actual Texture and not just a Tester Map, I re-created it in Photoshop! Now you can actually place
Checker v1.3.2 for Blender
Mesh Checker - Free Addon - BlenderNation
UV Blender
How can i see my UV checker grid on my object? - Materials and Textures - Blender Artists Community
Default UV Checker in "Viewport Overlays" — Right-Click Select