ITW Fastex fan mount rivets

[fmah]

I have some of these that I've used on and off that may be of interest. Page 4 on:

http://www.itwasia.com.tw/catalog/panel_fasteners.pdf

You insert the rubber piece into the fan and then push the plastic pin through the chassis hole and into the rubber piece. I'm not sure how to test compare the EAR and these though.