Well its prob not worth sending them to me anyway because I don't have any S12 hubs easily to hand to measure the correct offset of the discbrake.
The S13 discs will fit over the front of the hub. However whether or not the offset is correct I don't know. You may be able to remachine the discs though to bolt to the back of the hub in the normal way.
Of course i'd be ditching the standard calipers and using the 4 pots normally found on an S14 or if you like ally ones get them from a Z32.
Whats the dimensions of the disc? If they're 30mm thick you will need to use the 4 pots anyway.
If the offset is only slightly out you could just use washers to move the caliper inwards to the centre of the car
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