You can actually set any playable music file as your ringtone. The ones you are after could be found here, but right now the links are dead (I’m just trying to find out if they can be uploaded again):
Regarding the clock, that will be harder. I found the default clock on my FP3 wanting, too, and installed this one instead which was “basic” enough for me and didn’t waste too much space on design and misplaced controls and spent it on the actual clock and stopwatch themselves instead 
: Clock | F-Droid - Free and Open Source Android App Repository