I'm talking about the big one that hooks to the back of compresor and condenser, any one ever change it? I want to put a/c back in my car.

 

On my '95 there are 2 hard lines that are braised to a small manifold that bolts to the back of the AC compressor. One line goes to the bottom of the condensor, the second line routes up the to the top of the engine bay and the back and connects to an AC manifold located close to the PCM.