Actually it's quite bad that Yate Loon didn't warn me about such things.
I guess they figure most users have a big stash of screws for drives, fans, motherboards, etc. laying around. I have tons. Strip an old case or two and you will too. I actually like those isolating mounts - not only do they ensure any fan vibration does not resonate through the case, but they don't cut threads into the metal like regular fan screws do (same with some heatsink fans). When you use a screw to cut threads, the "cuttings" or tiny metal filings have the potential to end up bouncing around inside your case - particularly when you remove the screw. Something about metal filings bouncing around inside electronics just does not sound right to me!