Maybe not the right place for this kind of information? Nice looking "Hall Effect Sensor Board" http://e0designs.com/products/hall-effect-sensor-board/
50mm: Generic “50xx” outrunners
59mm: Hobbyking “SK3-63″ series
63mm: “C” style, “N” style, “G” style, “SK” style 63mm series
80mm: “C” style...