Sorry Dubster, but check the polarity of your batteries in your calculator. An 8" rim width, with 4.0" backspacing = Negative Twelve (-12) Offset. The posted measurements of the wheels are correct as stated; an 8" rim width, with 4.5" backspacing = Zero (0) Offset.
See "Offset Chart" in the link below:
http://www.readylift.com/t-tire-calculator.aspx
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