Unfortunately the rear discs are advertised by nearly all motor parts outlets as being available but this is not true. The 260 rear discs are larger than the fronts. Because the 260 is a very rare car not many people understand that this is different to the other models and wrongly assume that the discs front and rear are the same as the 190. (Fronts are the same). I replaced my rear discs last year and suspect it still had original discs in place so they may last for another 10 years, my car has only covered 57k miles...