Finding out which sites use my competitors Widgets

I was wondering if there is an accurate way of finding out which websites use my competitors backlinks.
For example 2 of my competitors are oil-price.net and their widget page is: http://www.oil-price.net/dashboard.php?lang=en
and the othe rcompetitor is www.sanebull.com - their main widget page is at: http://www.sanebull.com/widgets

Sure - i can see which links come up in google and yahoo - but is there some software or a program that will actually give very accurate results that someone knows of?

 

Define "results".

 

What i mean by results is a way to get a list of the sites that use their widgets.

 

look for a text footprint that is featured in the widget everytime and then search for that particular text string on google....