Plastic fitting, not.

[Chucktin]

I've noticed posts about loosing the rubber eyepiece surround, the flash shoe "cover", and lens caps.

On my XPro-2 16/55 I can't seem to get the lens shade on backward without trying 2-3 times, the lens cap doesn't inspire confidence, and the rubber cover for the lens shade for my wide angle (prime) lens will fall off just looking at it sideways

[Haswell]

I have found exactly the same things.

[Aswald]

Ditto on the lens cap. While I like the design, it always feels like they could fall off.

 

Try the lens cap of the xf60 macro. And not easy to find 3rd party for 39mm.