You're like a NNBS encylopedia Mike:worship:If you have a 1500/2500, then no; they are not interchangeable. Different shapes of lights/beds.
Only exception is if you own a 3500 dually, that is the only time when Sierra and Silverado's have the same bed shapes, thus exactly the same light shapes.
completely agree :worship:You're like a NNBS encylopedia Mike:worship: