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That just means backspacing. You should be good with the +1 offset wheel! Some guys are doing it with -20 offset wheels. They'll look good! Maybe someone else could chime in and just confirm, but I'd say you're good to go!Ok the options for 18x9's are 1 offset and 5"BSM or 20 offset and 5.75" BSM
Quite honestly I do not understand the difference in bsm and offset, so bear with me please.
http://www.fueloffroad.com/specs.cfm?id=2568&name=D515
link to the spec page
i went with that size on my truck, bils @ 2.1 on 18x9 -12 offset wheel. they rubbed a little on the wheel well liner but a lil work with the heat gun took care of that