My 2004 built 4/4 has superform wings but the narrow rear wings (in fact narrow front wings too, measured by the headlight/indicator positions) as shown on the photo of Budster's Stanley. So it's not specifically a superform thing. The axle width and wheel width/offset will be relevant too. I suspect the wider front wings will be why a newer 4/4 can accommodate 185 section tyres without rubbing.
