Originally Posted by
Mr IGH
I have both brands. Those fiddley plastic pieces are the stay caps, they attach such that they won't come off. The stay/fender attachment is the same as the PB fenders. I've switched my bikes from PB to SKS because of PB's lack of breakaway front struts. It's a very real hazard, there's been a few threads on the commuting forum.
+1. Those pieces are not needed for installing but are a nice finishing piece. Both fenders are nice but after trying both a few times I would choice SKS every time. But that is a preference...quality-wise they are pretty much the same.