Well, here's a quote from the owner who posted those pics on another forum: "The truck has 80,000 org. miles and a 312 w/3speed overdrive
so I fixed the rear fenderwells ( They where cut for dually wheels)
Its a 1/2 ton so next is to replace the rear end and lower it."

He lives in Las Vegas, a few miles north of Mexico & Argentina.
If you look at the second pic you can see the holes where they had the dually fenders bolted on it.