I've searched and searched, and still can't find a clear answer. I need to know what size rear rotors I have. Does the 10.5" rear end have the 4.63, and the 11.5" rear end have the 4.84 or do they both have the 4.84 and the 9.5" that comes in the 2500 have the 4.63. I read one post on here that said "all hd's have the bigger size".