If the triggers are products of Ben Rice, IMO it's frequently almost impossible to tell the difference. I've had several sets made by him and sometimes found it hard to believe that he didn't use original parts.

I'd have to see the tang to be sure.
Regards, Joe

Michael, 

JMHO, but unless you are trying to get the thing to "letter," I wouldn't worry about what was original and what was not... as long as the parts fit together and work and seem to be of good quality.  If it has been built up, it's no longer original anyway, so I would just be looking for the parts/features I want.   

As for the DSTs perhaps being from Ben Rice rather than Winchester... I now have three sets of Ben's and would not ever be concerned about having them.  Like JD said, "it's frequently almost impossible to tell the difference."  Rest easy and enjoy!

Charlie the Frog