That looks like an E body switch. Might fit some B bodies too. Im not exactly what switch the pre-72 A body used. Here is a 72+ 3 speed switch.
MOPAR 72-74 A & E-BODY 3 SPD WIPER SWITCH PN-3488764 CUDA CHALLENGER DART DUSTER | eBay
Notice the resistor, that is how they get the 3rd speed out of it.
