You're right the stock ones are black(Teves) and the replacement calipers are silver(Akebono). I just replaced my calipers, brakes, and rotors two days ago(Sunday). I ordered the kit jeep put out with the replacement calipers and new Akebono ceramic brake pads as well as a set of brembo rotors, the stock replacement ones, from www.tirerack.com
, total w/ shipping for two rotors was under $80. Oh, I ordered the replacement kit from www.1stjeepparts.com
, it was $170 and some change, not including shipping. But all and all I must say so far I'm very pleased, the Jeep brakes like new again! The calipers were supposedly the culpret of the Jeep's breaking "pulsation" and the rotors warping. If your thinking about doing the mod and need any more help or info, just let me know.