A:AnswerI bought one at a store that didn't fit. I found a 51s online at Best Buy that looked right and it was. 51s is not sold in stores. Too old, probably
A:AnswerThe 51S comes with 2 pieces, foil and cutters; the 52S is one piece fully assembled. They are not interchangeable. When you see the "S" and "B" after the number, S stands for silver, B is for black.