Hi Q-List, I'm still wanting to upgrade the brakes, when I suddenly discovered that I have to upgrade my 14" to 15" or bigger wheels. I'm leaning toward the 80/90 strut and G60 brake solution, but have a stupid question: Are the hubs from the Ur-Quattro and the 4K Quattro interchangeable? I know the Ur-Q hubs have 5 bolts, but will they work in a 4K strut? TIA Rob Germany