I got these two sets of pads with my new race car and want to know about them. the pagid 554, U4505-554 are used and look to be about 1/2 the thikness of the Ferodo FCP1282H Pads which are NEW. These are for the BMW Calipers, as the car has them on all 4 corners. Can anybody tell me about these pads and what their charicteristics are?? Anything else??