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which rims?

2839 10
i have a 2006 cummins with bushwacker pocket flares, i want to get blacked out rims that stick out at least 2 inches on each side of the truck to match the flares. I would like to keep the stock tires on the new rims, but what offset and backspacing should i do to make it wider? also does postive mm make it wider or negative make it wider? Im looking at american racing atx series 17 by 8.5 with a 15mm offset and a backspace of 5.375/137. will these be wider?