7.3PSD

Hello, I'm new here, I'm in the market for a used truck, looking at a '22 Silverado 1500, It has around 17k miles on it, My questions are, why does it have Tow mirrors, and cab lights? Is this a factory option, or did the previous owner do this? Attached is a picture of the truck. Also, anyone with this truck, have anything to say about it? It's the 2.7L model. Thanks!