I had to replace a zing ear # E-89885 switch in a Hampton Bay cieling fan. I was able to find a replacement at Home Depot.
It is a Fantec 21105 3 Speed Fan Switch. CAM #05. Single Layer 3 or Four Wire Applicaton. Split Continuity Function.
Sequence of operation:
Pos 1 off (3 not connected)
Pos 2 3-L-1-2
Pos 3 3-L-2
Pos 4 3-L-1
Hot wire (black) goes in 3