This used intermittent wiper switch has a two speed wiper function, but when turned counter clockwise, it has a rheostat that sets the different delay times. Switches can be physically marked with casting numbers of C9ZB-17A553-E, C9ZF-17A553-B or C9ZF-17A553-C. Any of which can be correct, and chances are, there are probably other casting numbers out there as well. This 69 switch has a total length of 3 3/8". A 1970 switch can be used, but the shaft is about 3/8" longer. Sometimes this unit is called interval or delay wipers.
*NOTE* Must be used in conjunction with a Intermittent wiper controller.
Part # C9ZF-17A553-B, MPC # C9ZZ-17A553-B