ebay and classifieds, there might be some sites but i dont know of any off the top of my head...I got mine off the classifieds here for $100 and that is a really low price you can probably find them from $200-300 and if it looks dirty or so, sand it down and paint it so it look nice.
Your best bet may be to get a lower from a gen1 lighting as they ran a 351 with gt40 heads and intake. The upper is a tube style on the gen1...but if you can get the lower and find a 94-95 cobra gt40 upper it will be the exact same thing as the factory 95 R intake.
The lower is going to be the big issue though...check out www.nloc.net.
i just saw the R part...but i would still stick with looking on corral and on ebay...you see them every once and a while...of course people ask a little bit more for them though... Good Luck