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8 x 6.5 is the bolt pattern, but I don't know much about the offsets. Stock back spacing is supposed to be about 6.5", if I remember right. Offset is a measurement, taken from the centerline of the rim. Backspacing is measure from the back edge, or lip of the rim. In a way they are the same exact thing, just measured from a different point, if that make sense. Also, offset is usually in mm, and backspacing is in inches.

Easy enough to figure out. Just convert from mm to inches, or vise versa. Divide or multiply the mm by 25.41 to do the conversion.
 
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