I've got 3 front rotors, 2 from my K75 and one I bought off ebay. I had surging when I applied front brakes, noticeable at slow speeds. I thought it was the non ABS ring one, but it turned out to be the one with ABS ring. So , the 2 plain ones are fine, the one with ABS ring has a slight warp, which some say can be corrected. I think it's warped as when replaced surging disappeared. they all measure 0.16. 0.14 is wear limit. none are badly scored and are in good shape
$50 each for the non ABS. I'll throw the ABS one in if you buy one of the others and you want it. . They will fit in a USPS medium priority box, so $15 shipping CONUS.
the top and bottom one came off my K75 with 15k
middle one was purchased on fleabay