Looking for a "what" is just the same as if you were to say that a self receives the results. Although you have removed the idea of self, the mind continues to force some concept to be the receiver. Why? Because logic says there is supposed to be an answer to that question.
The way I understand it, the results will come about in experience. Who's experience? What's experience? Going that extra step to look for that answer will only lead to confusion. There is experience and the results of kamma come about in that experience.
Just the way I see it. Hope this helps.