Baja Warrior Kill Switch and Brake Lever Questions

#1
Just purchased a baja warrior and it needs a new brake lever. Will any standard brake lever work (from a bicycle) or should I get a certain one?

Also, I'm trying to wire the kill switch (you currently need to manually ground it to shut it off), but I'm not sure where to connect the circle part of the switch?

I have the stock switch pictured here:

killswitch.jpg
 
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