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More often than not, it is the left hand (driver's side) tread inserts that go MIA, so that was the number provided, but I "liked" that you made the distinction between left hand and right hand sides, as it was unclear.
There is also FL3Z-16490-CA / FL3A-16491-CA.
And there is at least one Ford parts source description that describe these step pads as interchangeable Left & Right.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.