What brake setup does this AU2 XR6 VCT have?

[inventiv]

Sorry to dig up an old topic, I did a search and found this thread useful:
http://fordforums.com.au/showthread....um+brake+specs

Basically I'm planning to overhaul my brakes and I read through the above thread's posts, and russellw's link as well in that thread. I'm a little confused though about my car's brake rotors and their sizes - so can I please get some help from peeps who know the specs of AU brakes and AU Tickford Premiums?..

These photos are of my front brakes:



And these are of the rears:



Can anyone tell me why the rears are grooved yet the fronts are not? I measured the rotors and the diameters for fronts and rears are the same as what's listed in that thread for the Tickford Premium brakes.

So why no groves on the front? Did the previous owner save some cash when it was time to replace the gooved ones, or am I kidding myslef and this isn't actually a Premuim brake setup but some sort of hodge podge setup?

I don't want to go to the trouble of buying new Tickford Premium spec rotors (grooved and probably from DBA - someone please tell me if there's better for the price) only to find that they don't fit.

What's everyone's take? Does this AU2 XR6 have premium brakes or not?

The rotors are vented at the front and solid on the rears.

Cheers in advance