Thank you for your kind comment, the calibrate balls i just made them manually it’s so simple make two spheres one normal material second metal with roughness and for the color calibrator they are a lot in internet here is a link just download the image and send it to Blender.
https://www.amazon.co.uk/X-Rite-ColorChecker-Classic-color-Rendition/dp/B000JLO31C
Hope that help