Brembo is AN OE supplier...to those manufacturers
Ferrari has used brembo since the early 90's before that it was a mixed bag of either brembo or ATE

Ford GT uses brembo brakes and the new shelbys will as well

corvettes and any of the cadillac spec V series use brembos

M series BMWs do as well


don't buy car parts on ebay...when it comes to rotors I ususally use www.stranoparts.com they have some of the best pricing I have found on high quality rotors and pads.