Cat converter o2 sensor problems

i know these questions are post every day, but i replaced my o2 sensor on my cat and i cant find the harness where the sensor plugins into. Lifted the car and searched for 30mins and could not find it anywhere does anyone know where i could find a wiring diagram for it?

btw i have 1998 honda civic ex 2 door

well nevermind just found out after my buddy at honda looked at my car the previous owner of my car must have swapped exhaust system for civic dx and put on this ex, so i gotta buy all new exhaust system, anyone know some good sites for a decent full catback exhaust system?