Late Model E153 Slave Cyl Help

Hi Guys,
 
I have just had that wonderful experience of the clutch peddle going flat to the floor and staying there  thankfully I was able to still limp the car home.
 
Anyway looks like the master cyl has decided its had enough so I am going to have to replace that and I thought whilst I'm at it I will also replace the slave cyl as I don't feel like repeating the process if the slave decides to die shortly after. 
 
Anyway I was wondering if anyone happened to know the piston size of the slave cyl on the later model E153 boxes
Toyota Mr2 SW20 1992 - 1999 Clutch Slave Cylinder 22.22mm 
Toyota Mr2 SW20 1992 - 1999 Clutch Slave Cylinder 20.64mm
 
A supplier in Melb has too different slave cyl and they are listed with two different piston sizes for the same year I am guessing one is for the turbo box and the other for the non turbo box, I was hoping someone may know which one I need.
 
Kind Regards
Nikayla
 

Hi Falcon,
 
I just got a call back from the parts supplier and he was able to cross reference the factory slave cylinder part number (31470-17040) and apparently my car should have the 20.64mm slave cyl.
 
What year model is your car?

Hi Nik,
I reckon that I have my old internals, which I replaced about 6 months ago. My car is 1996 N/A.
 
I will have a look & measure when I get home.

FWIW, my '90 model ADM uses a 22.2 mm diam clutch slave.

Hi Nik.
Could you let us know the size of the original one in your car when it comes out as this could help explain the problems sometimes experienced in these swaps etc.  Would be much appreciated. 
Thanks  Doug.

Hi Guys,
 
So I replaced both the slave and master cyl in my car I put in the 20.64mm slave cyl that I was told should be the size my car needs, after bleeding the clutch system the peddle feel was a lot better (slightly firmer) and the clutch take up point was further away from the floor then it had been previously.
Once I had the car up and running I measured the diameter of the old slave cyl that came out of the car which was 22.22mm, so I am curious now if the slave cyl had been changed by a previous owner at some stage of if this was the size from factory? Currently though I am happy with the feel of the 20.64mm slave cyl over the 22.22mm that was in the car previously.
 
Cheers  

I didn't need to readjust anything, once I bled it up it as all spot on so this is another reason why I wonder if it possibly had the wrong one in previously.
With the clutch master cyl there seems to be only one bore size, I just did a parts search on toyodiy and it gave me the same part number when I searched NA or Turbo cars.

Hey Nik,
 
I came across this problem when installing my ATS 5 puck clutch.
 
So the JDM 3sgte Gen 3 SW20 (1993-1995) Slave cylinder is in fact the larger bore. Although in 3SGTE Gen 3 enignes after 1994 (1995+) went back to the smaller bore slave.
 
When I installed my ATS 6 puck clutch I noticed that I had to adjust my all the way out as the engagement point was like through the floor. After research I found that if I was to install the gen2 smaller bore slave cylinder, I would get more throw due to the smaller bore size. Which could make sense as the ATS clutch is suited to the gen2 mr2 which is what USA got across their 90+ production years (so I believe)
 
So I would expect if you installed the smaller bore slave and still have a factory clutch it may feel different, and maybe if you are upgrading clutchs it may help out the the heaftier pressure plates.
 
Cheers