Here is a convenient link to download the Recommended Sun Solaris cluster patches via Sun’s SunSolve website. There is also a patch finder on the web page and all you have to do is enter the patch ID or patch ID with revision. I find the patch finder is a very handy tool and use it frequently. The other day I used it to quickly find a patch for an LTO3 drive.
By the way, I had to register to download the cluster patch. Here is the link to the download site.