They are mirrors of each other, but not interchangeable from left to right, due to the minor offset angle on the end, receiving the blade. The wiper arms & blades sold by many of the aftermarket truck parts suppliers are close, but not quite the same, as their original counterparts. The blades are 13" and they were originally manufactured by Trico. They had a clear finish stainless steel finish on them. Each blade has tiny red release button on each end, to allow replacement of the blade, when refilling.
