I actually recommend if you lose your clutch hydraulics replace BOTH the master and slave and get a new stainless braided clutch hose.
If you replace one, the other will fail shortly thereafter. Also, the stock rubber lines can and will fail, especially after monkeying with the master and slave replacing them.
Do it once, do it right.
The master and slave are commonly available from either Mazda or some parts stores. For the stainless clutch line, I have one from Corksport, about $20, works, fits, and looks great.