how to install a stereo and amp

My stereo was stolen from my car. the mirical was that the theif did not mess up any of the wires that was hooked up to the old unit. So I went out and bought another one thinking i could just plug it in where the old one was(I had never bought a radio or installed on either). I have since learned how to install a basic head unit, but still need help with installing my amp.My propblem the new sony unit I bought dosen't have a place to plug in any RCA jacks. So I went out and got a high/low inpedance adaptor going by what stores told me I Needed. But I still can't get my amp to work. How do I hook up my amp given the current problem? Is this Impedance adaptor what I need? I really liked that thread on "The correct way to hook up a car stero." this is the kind of help I'm looking for. Your help is really needed.

No you need a line out converter. This will enable you to take the factory speaker wires and convert them over to an RCA output. I cant believe they dont have a set of outputs. even the $50 one from wally world has them.

An LOC cost about $20.

Sorry to hear about your stuff, these people need to learn to work for what they get not be lazy and steal it. Its pisses me off i cant even leave more doors unlocked anymore.