I didn't vote, because after reading your post I have to think that your poll and your question don't really match. Your question asks about a turn to the right, but your written description is describing a turn to the left.
As R3 said, it should be the "inside" hoof that is planted, and if the horse's hindquarters are moving to the right, then it is the left front that is the inside hoof, and that is the one the horse should be turning around.
In a pivot to the right, the hindquarters are moving left, and the horse is turning around his right front.
I suspect you've been getting conflicting answers on this because of how you ask the question. If you ask about a pivot to the right, people will tell you the right front is the pivot foot. If you describe the turn as you have here, then people will tell you the left front is the pivot foot, because you are describing a pivot to the left.
With pivots, it can be helpful to think of it as a forward movement--the horse should be walking around that pivot foot (whether it is front or hind). If the horse is pivoting around the wrong foot as he makes his turn, he will actually be backing up around that pivot foot!