Is this what your talking about, this line goes from the master cylinder to the slave.
The goodridge ones replace the flex factory line only, a complete waste of time unless your old one is leaking or car has ultra ks on it.
The main reason for fitting a complete replacement line is that it does away with the steel line that goes across to the pass side to a flex line and back to the slave cyl and the useless brackets that hold it to the back of the engine.
Cost is around $65 for the one I had done.
Terry