Where to find recents icon?

[1theo0]

Where should I look for this icon? I found it in two places
/System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/Clock.icns
/System/Library/CoreServices/Finder.app/Contents/Resources/ClockSearch.icns
The one in Finder changes the icon used in Finder Sidebar Preferences, but it cannot be seen in the sidebar itself. Do you happen to know what icon I must change? Please tell me if you do. Thanks.