You can find patch clusters for all current releases of Solaris at:
http://sunsolve.sun.com/private-cgi/show.pl?target=patches/patch-access
I think you may have followed the wrong link from the Sunsolve homepage to this page:
http://sunsolve.sun.com/search/document.do?assetkey=1-21-117480 "SunOS 5.9: pkgadd Patch"
This is just a patch for pkgadd, and not a cluster.
Mod.