Mystery mostly solved, thanks. But, no, never had a 650. My 550 arrived with what looks to be a 650 fender, because it has a hole on the left side for the plastic cable guide, whereas on the 500\550 it's on the right for the speedo cable, but it still had the welded on hoop\bracket for the brake hose. These 650 bits must have been in the odds and sods that came with the 550, but 2 of them?
Anyway thanks for that, they can be forgotten about for now.