Need new switch for motor

I have a off and on faulty switch on a Hayward SP1520 Z1 ESC motor.  It is an AO Smith motor with part number-

7 193554 BZ03-019.

What replacement switch would work with this?  The original was a timer, but I found out that the timer is no longer made but I still need to be able to turn on the motor.  I can always add a separate timer.

Thanks.