help Im confused I thought 57 and 58 rearends were 9 inch/ but the 57ford.com site says that they are 8 3/4 but a 9 inch carrier can be installed/ and that true 9 inch didn't come out till 1960/I need to get this cleared up before fri night/Im driving up to lincoln nebraska Sat to look at 2 57 and 2 58 rear ends and now Im not sure what this person is selling and up till this afternoon I thought that they were 9 inch rear ends HELP