How to Import Blender 2.79 built-in matcaps to Blender 2.80? I'm missing my favorite matcap from Blender 2.79 in 2.80, this one on the left, indicated with a blue border:



Is there a way to extract matcaps from 2.79 and import them into 2.80? Or maybe there is a repository of old matcaps as images, somewhere in the Blender git?
OP's comment here reminded me that you could probably check the v2.79 tag (i.e. release) to find these files.
Here they are on the official repository:
https://git.blender.org/gitweb/gitweb.cgi/blender.git/tree/v2.79:/release/datafiles/matcaps
Here they are on the GitHub mirror:
https://github.com/blender/blender/tree/v2.79/release/datafiles/matcaps
The one you're looking for looks like Matcap 9: