Your going to need a new seat track assembly. The broken piece is not serviced seperately. To replace it just unbolt the seat cushion from the track assembly. You have power seats, so be forewarned...that part is not cheap. You might be better off going to a salvage yard a get a used one.
There is no recall for that failure. I've seen it happen every now and then and its not limited to just trucks...cars also will do it.
Can you weld? or know somone that does? A competent welder ~might~ be able to weld it back in place...but I dont really think you'll be able to fix it IMO