replica but have seen it on the car and you really cant tell the difference
it's just fitting it could be a real pain in the ass with a replica. If you are going with a replica kit, I would go with one a maker that has a good reputation. EPRacing is one place to consider from what I have heard.
http://www.epracing.co.uk/
EPRacing are members on here. I'm sure Jeff will be able to answer any questions you have.