How to restore Yosemite finder sidebar icons after changing folders with symlinks After I installed on my mac a second drive I figured out it was a good idea to use the old HD for storage. So I symlinked ~/Downloads, ~/Documents, ~/Music, ~/Pictures and ~/Movies in order for them to be actually located in the old HD, while I'm using the new SSD as a startup disk.
Everything works remarkably ok, except, now the icons in the finder sidebar for those folders are the default ones:



Even though in the finder preference the icons are ok:



I already tried this answer but I was only able to restore both the actual folder icons, but not the icons in the sidebar!
It might be the case that, unfortunately, you can't do this.  See this answer:
How come Dropbox gets an icon in Finder sidebar?

and this one:
https://stackoverflow.com/questions/8380562/adding-buttons-to-finder-toolbar