TaneshaRB25

So I have a Rb25det Laurel, and I'm guessing that the slave cylinder has shat its self, I don't really know what kind I should get to replace it, it has a 20det gbox, and a heavy duty clutch but that's all I know i don't know if that has any relavince to the slave but yeah what should I be looking at geting. Don't want to spend big bucks as I need it asap.