Copy to system - media - audio
Make a backup of your audio folder just incase you dont like this ones.
Audio , alarms,notification, ringtones , ui Folder permisions rwxr-xr-x
All the sounds permision ( in the alarms , notifications , ringtones , ui folders) rw-r-r
press thanks if you like them
And if you use these in your rom , giving credits wont hurt.