isaac (administrator) owns one of the VERY few authentic r2 kits.
r2 only made about 10 (maybe less--i forget the exact #) of the kits so good luck getting your hands on an authentic--you'd have to buy one used and obviously from someone who was willing to part with it.
one place to buy a ripoff though, is www.autosportz.com
... lat time i checked it was around $600. but in my opinion, a ripoff is a ripoff and isn't worth the trouble. but if you really like the design that's really the only realistic way to go. also, in this case, a ripoff kit doesnt do the manufacturer any harm because as i already said they don't make them anymore...usually it's not a good idea to support a company that is basically 'leeching' the real thing.