finder toolbar icons... where are they?

[3mors]

i wrote an applescript and i'd like to add it in finder window toolbar.
i'd like to put an icon in the same style of the other buttons (like the ones for the view options)
do you know where i can find them? i've looked into finder.app and coretypes in coreservices folder, but i can't find them

thanks

[EDIT]
i've just found similar icons in safari.app resources folder