I sell these rebuild kits for $20.  They are made by Lucas who I think is in
partnership with Girling now.  A new ATE slave cylinder is $50 and alot less
trouble unless you have the hone that is recommended to rebuild the old
cylinder.  Just FYI.

Thanks,
Ken Wilford
Van-Again
John 3:16
http://www.vanagain.com
Office: (856)-765-1583
Fax: (856)-327-2242