You have a 13" rear brake kit? I didn't know anyone offered anything that big for a rear brake setup.
Yep, a 13" rear kit! I bought the kit from Dr Diff back in early 2008, but looking at his website this morning it doesn't appear as though he offers it any longer.
Here's a poor pic w/ wetsanded quarter panel, but they are the Cobra rear calipers w/ parking attachment. I believe the rotors in this kit at the time were Porsche.