4in backspace or less will fit. 4in may need a touch smoothed off the corner of the calipers though.
However... keep in mind thats already pushing the outer edge of the rim 2in further out than the stock ones, add to that most after market rims are at least 8in, your now 2.5in further out. This takes your track around 5in wider than stock - 3in past legal and way past your stock guards.
(Copied and pasted from the last time I answered the same question
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