Can someone tell me the exact size of the original '66 10-spoke wheel including backspace. Some say 7" wide and some say 6.58" wide. I know the reproduction are 6.58" wide but was curious if they are the same as the original. I've also heard 4" backspace and 3 5/8" backspace. Also, If the car came with the 10-spoke, eactly what size tire did you get. Thanks