wait, so u have rear GTR guards, on a GTS-t?
and im going off the ad on ebay, that says they are 18x12 -4, but ur saying the offset is unknown.
im confused lol, im not following that well.
also flares may create a nice veranda that covers the tread, but wont give u as much clearance for the tyre going up into the guard. each to their own. not a fan of the mexican look, would rather see a more flush look.