T-slot rail on Tonneau cover?

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toilet slot Truck Bed Tonneau Cover 441KBTY Retrax Pro XR Tonneau Cover 2 Year

the invisible man slot Well-known member I have the same cover, but mine doesn't have that rail on it Probably added by the previous owner  BESTWYLL Electrical T Slot Pickup Truck Bed Electric Retractable Tonneau Cover for 2012-2021 Ford Ranger Xlt Double Cab E-K04, Find Details about Hard