Hi Mark,
I'm really glad you got a C5 they are awesome machines. I know what you mean about the attention you get on one - people just love the C5.
As for the centre hubs, you might struggle, I was lucky enough to get some, but I spoke to Adam Harper about getting some, and the bad news is they were never supplied as a seperate item, even tho they have a part number, then only come with complete hubcaps. Adam sells these at 40 quid each, but they are brand new mind.
I think you can buy some non original ones I have seen some somewhere but I'm one of these funny buggers that like original parts
As for wing mirrors being bendy - not really the plastic case bends if you wobble them but they should be quite firm. I got some new ones from adam, and make the thing look fantastic - and they really work too.
Good luck with ya C5 dude
Regards
Ian