1 tire line. 38x15.50R26 tires sized to your wheels and your car.
A 38x15.50R26 stands 38 inches tall and 15.50 inches wide on a 26 inch rim, the metric equivalent is 394/39R26. A tire size only makes sense next to a wheel width and a car. 38x15.50R26 mounts on a range of widths, and the overall height decides whether the speedometer and the fender stay happy.
1 line carries 38x15.50R26, 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 38x15.50R26 lines that do both.