I don’t know if it’s just my own ignorance or oracle purposely obfuscating the latest patch bundles for Solaris but I recently had a hell of a time finding the January 2017 patch bundle for Solaris 10. Oracle kept sending me to a page recommending I use sunsolve.sun.com which of course no longer resolves.
Finally I was able to find the following links for the latest current patch bundles for solaris 10 (OTN login and service contract required of course). Once you log into your oracle OTN account you can use the following links to get the latest Solaris 10 patches.
https://updates.oracle.com/patch_cluster/10_Recommended.zip
https://updates.oracle.com/patch_cluster/10_Recommended.README
https://updates.oracle.com/patch_cluster/10_x86_Recommended.zip
https://updates.oracle.com/patch_cluster/10_x86_Recommended.README