It's common for these bolts to damage the wiring, but these seem to have been installed without doing that. There are some extra wires under this threshold; probably for a (missing) amp. The U-nuts on the body rail say that this truck came with cab steps.
Install StepShields $50 (includes remove unused step hardware)
StepShield (universal) 
![03steps.jpg It's common for these bolts to damage the wiring, but these seem to have been installed without doing that. There are some extra wires under this threshold; probably for a (missing) amp. The U-nuts on the body rail say that this truck came with cab steps.
[url=https://www.supermotors.net/registry/media/885753][img]https://www.supermotors.net/getfile/885753/thumbnail/01stepinstalla.jpg[/img][/url]
Install StepShields $50 (includes remove unused step hardware)[url=https://www.supermotors.net/registry/media/1159237][img]https://www.supermotors.net/getfile/1159237/thumbnail/20200501_181204.jpg[/img][/url]
[url=https://www.amazon.com/dp/B00062YD0K]StepShield (universal)[/url]](https://www.supermotors.net/getfile/1161172/fullsize/03steps.jpg)