My son bought a '93 RS 6-cyl from a private seller but the tires/rims are too big for the car (rear tires rub, especially with passengers). The seller said shocks were too "soft" for the wheels and provided new shocks (still in the box) when we bought the car. But even with the new shocks it's not right. Can't find anything on tire/wheel specs to know what we need to get. Not looking to impress anyone, (my son can do that when he buys his own wheels!) I just need to know what to put on the car to make it safe. A friend at work said T-series rather than Z-series which makes sense, but it's not much help when trying to research tire companies online. Any help would be appreciated!