Clutch Master Cylinder

Does anyone know if they make a rebuild kit for the clutch master cyl?
This is on a 95 4cyl XJ. Also, how the heck do you bleed the line on those master/slave combo units????

Update: Replaced the whole master/slave unit but still not sure how they're bled. The new one came with the fluid in it.:eek7:

I have a 1991 Cherokee with the 4.0L 6. The bleed is on a line sticking out of the transmission right below the hydraulic in line into the bell housing of the transmission.