What's the location (path) of these icons/buttons for OSX Lion? what is the width, height? What is it called? Finder Icon or Finder Button ?
They are located in an Apple Asset Catalog proprietary .car archive format at:
There are also other .car files in that folder with icon images for various system display settings.
You can browse and export images from the Assets.car file by using the AssetCatalogTinkerer tool: