I have a few of these hood hats for my fuji lenses so I figured I'd share my experience on them really quick.
I use three different sizes on three different lenses. I use the Mini size on the 35mm f1.4, the Micro size on the 18mm f2, and the PK Micro on the 27mm f2.8.
The Micro and PK Micro fit their lenses perfectly. They are tight, stay in place, and are still easy enough to get on and off. With the 35 the Mini is just a little loose and the Micro is a little tight. Both can work but I prefer the Mini since the Micro gets caught on the lip of the lens once its past the lens hood.
The PK Micro would work on all three lenses but will only cover the lens hood as it is made for pancake lenses (thats what the "PK" stands for). On the 27 it does cover the whole lens and has proven to be great protection for it (the 27 is always on my x-e2 which is my "throw in a pocket and go" combo...aka "poor mans x100"). The Mini fits the 18 as well as the 35 but, like with the 35, it's a little loose on it and it covered the whole lens.
If you're looking for an alternative to the crappy rubber hood caps on the 18/2 and/or 35/1.4 or want a nice cover for the 27/2.8 then check them out. I've been using both the PK Micro and Mini for over a year with no problems (The Micro, as well as the 18/2, are no additions)
Here are all three on their lenses and the PK Micro on the 27/2.8 on the x-e2