hey im getting a z06 clutch put in my 98 z29 m6, i herd you need to replace the *hydraulics* with a new clutch install. Supposedly this is the clutch slave cylinder/actuator. I can get this from gm parts direct for around 80 whereas ls1speed says new hyrdaulics are 279. Is this what I need? And what should I go with? Basically what is the difference?