Length of OEM bed side rails?

[Overland Maverick]

Does anyone here know the actual length of the oem bed rails?(or at least the maximum length you can mount. ) I watched the diy rail video from ford, and it highlights a 30 inch rail but as you can see in the video, there's Clearly enough space and another threaded hole for a longer rail.

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[Edge Haley]

The author of the video was probably trying to make the rail from a 60" piece cut in half for 30" rails to save cutting and costs. There are 10' pieces of the 12 gauge strut framing rail that could be cut into maximum needed length, probably 36 inch lengths needed, hard to tell with having hands on the truck. Look like all of the pieces needed could be found at Lowes.