I know where the tail lamp covers are available from
http://www.upauto.co.uk/is200bs.htm
they are £45 +VAT which I think is quite a good price. UPAuto are based in Nottingham
Dont know about the carbon look though. I would think that these come in primer ready for painting. You can get carbon fibre in adhesive backed sheets though, so it wouldn't be too hard to do.
My personal opinion is that the rear lights are one of the best features of the IS so I cant understand why anyone would want to cover them up, but that is just my opinion
By the way, I went with someone to a BMW dealer the other day and saw one of those ugly 3 series compact things. How much have BMW ripped off the IS lights on that car! They should get the arse sued of them:yes: