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I have 18x11 et 56 BBS at the rear. There is not much gap as it is but I think another 6mm would be just about doable.
Amount of camber, ride height and tire width matters of course.. I am running -2.3 degrees camber and 295/30 tire.
They are BBS LM's. I attached a photo to show how they fit. The edge of the wheel is pretty much inline with the top of the fender opening. It looks like et 50 would be a really tight fit..