I've only had to change one on mine but the car had been sitting 13 years before I purchased it. Dorman CS103489
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
If you've gone thru two for shaft seals, I'd suspect its an alignment issue.
Take the removed slave apart by blowing the piston out with compressed air. Take note of the wear pattern on the piston and barrel clock angles in the bore.
It will help you determine which way to move or shim the Next Slave cylinder to lessen side loads (which usually cause premature failure).
The Slave Cyl/Mount kit sold by Iconic may help you.
https://www.iconicparts.com/clutch-slave-assembly.html
DOT 3 fluid btw.