Thank you for your suggestions I did give DBA and RDA a call and they didn’t have the particula rotor I was looking for. Upon some further research I found a brand called Dixcel which after a quick phone call they did have the rotors I was looking for.
http://www.dixcelaustralia.com.au/
Here are the part numbers and specs for the front and rear rotors on a R34 GT (non GT-V)
Front rotor #3212011
Outer Diameter: 280 mm, Thickness: 26 mm, Height: 49.2 mm, Centre Bore: 68 mm, Holes: 5, PCD: 114.3
Rear rotor #3252018
Outer Diameter: 266 mm, Thickness: 16 mm, Height: 64 mm, Centre Bore: 68 mm, Holes: 5, PCD: 114.3
Hope this helps a few people that have had trouble finding them.