Steve_A,
Two of us over here in the Wild West had the exact same problem about five weeks ago.........check out thread.....
http://www.mr2australia.c./mr2play/tm.aspx?m=91308I had both cylinders rebuilt and reinstalled in one day. The rebuilt cylinders now come with a lifetime warranty.
As I have an AUDM SW20, I went through Toyota who arranged the rebuild and reinstallation for me............Even the guys at Toyota commented on how difficult it is to get them out and back in again. Of course the cost of labour was a killer.
To buy entire new cylinders from Toyota is expensive and will take time, it is usually just the insides that fail, so the rebuild option is usually the best when there is nothing wrong with the cylinder housing.
It appears to be the time in the SW20's life that the clutch cylinders fail, have to admit that 20 years is good going considering the number of times the clutch pedal would have been pressed over those years.
Have a chat with your local Toyota Servicing department and they should be able to give you the name of a local cylinder rebuilder.
Best of Luck
Cheers, M