Hi
I'm not sure what model Super you have. I have 2 x 1303s, one a 73 with 3 bolt struts and the other a 74 with 2 bolt struts.
I'm running skinny struts, they are a must for any wider wheel on a super.
On the 74 which is my daily but is off the road at the moment, I'm running 17x7s with a 55 ET, on the front they fitted really well, on the rear they were in to far, so I fitted some 944 steel rear arms and brakes, these pushed the rear wheels out enough to make them fit really well, actually 25 mm per side.
Steve