PSM
Rectangular Cased Magnet
Length: 30 mm (1.181 in)
Height: 7 mm (.276 in)
Width : 20 mm (.787 in)
Width : 20 mm (.787 in)

MP4428M
Material: ABS
Size: Length: 72.0mm (2.83in) Height: 13.0mm (.51in)
Width: 12.0mm (.47in)

MP4450M
Material: Moulded Polystyrene
Size: Length: 30.0mm (1.181in) Height: 20.0mm (.79in)
Width: 9.0mm (.35in)