I have looked everywhere for a 3 speed (4 wire) pull chain switch but I can't find it anywhere. Even with the manufactures. The replacement part I need has 4 wires (grey, brown, black and purple) Am I the only one having trouble finding this part?? Can you help me locate it??

Should be able to find them at HD, Lowe's, Ace etc. Colors don't mean much, number of wires do. Any 4 wire switch should work, although you may have to play around with the wiring. Match the black and go from there.