You can get one for the RS3, however it is the same as that for the S3 and there is a slight problem in so far as while it fits the rear, it wont fit the front as the brake calipers are too big. If you puncture on the front you would have to change rear onto front, then fit space saver to rear. Probably no bad thing as at least you would have a decent front tyre, albeit marginally narrower on the front for the steering