Need Some Keyless Entry Knowledge
 

I have a 2002 LX Sedan and wanting to add a factory keyless entry. I took a receiver module out of a 2003 ex coupe but it did not seem to be the correct one. The one from the EX seems to have more wires.
I was wondering if anyone knew what receiver may work and/or have a part # or any other info you may have about adding keyless to the car. Thanks in advance