I'm only writing about the assembly for the time being, because I haven't thought about it yet. Rear bumpers on my 2019 Nissan Frontier Pro4X 4X4 and installing a new Timbren Tortun4L. All you have to do is completely loosen or remove the four nuts on the bottom of the fender mount, remove the old fender and replace with the timbre. I recommend using a tang on the socket wrench to lengthen it for better leverage. Start on the passenger side to understand the process as the driver's side is a bit bulky with the spare tire getting in the way. It's easy and I'm not a mechanic at all! high-quality materials with a good fit. No difference when driving without a load