1 tire line. 37x13.50R28 tires sized to your wheels and your car.
A 37x13.50R28 stands 37 inches tall and 13.50 inches wide on a 28 inch rim, the metric equivalent is 343/33R28. A tire size only makes sense next to a wheel width and a car. 37x13.50R28 mounts on a range of widths, and the overall height decides whether the speedometer and the fender stay happy.
1 line carries 37x13.50R28, from AMP. The tire has to stay near your car's stock height and mount on your wheel width, so pick the car and the wheel set and the page keeps only the 37x13.50R28 lines that do both.