Here are the requested Safari 6.1 Beta Build for the good old Mountain Lion.
Have fun with it and happing testing!

Safari 6.1 Beta Installer (ML)
(SHA1 ff45efd4d290e21d943353a9f7ebee6f49ab3d3e)
Safari 6.1 Beta Uninstaller (ML)
(SHA1 6211343945b9110e160ada583ac5c3803aae94e8)