Someone breaking an ek9 will be able to supply you with the holder I would have thought. The actually flares I don't think are car specific, but I may be wrong. Seen them on eBay a few times though, so may be worth looking on there.
Yes maybe is not for a specific car,i know that dc2 and ek9 have it but maybe only these cars come from japan are with the flare.
Yes i see one on ebay long time ago but it is very rare to find!
The reason why they are rare is that they are classed as an explosive and often removed when cars come into the country I believe (correct me if I'm wrong). My EK9 never had it, and I either sold or binned the holder a long time ago.
Yeah, they are meant to be removed on import as it's classed as an explosive. I've got mine still sitting in the passenger footwell don't think they are worth much though!