I'm not sure how you could pull the mounts through, as like I said...they're pretty solid.
The "rubber" mounts are also smaller than the thickness of the fan, so they couldn't be pulled through anyway.
I guess I could just buy some long stretchy fan mounts...but I would have preferred not to have to.
Actually just read this from another site/review:
"As for the rubber mounts, they are a bit of a pain since you require a special thin screwdriver or similar tool in order to force them through the mounts on the fan chassis and they break rather easily. Also the item you get does not match the one pictured on the website. The ones I received have their chassis closed and not open".