I suggest purchasing a set of Torx sockets that way you've got all at your disposal rather than buying one by one. I got mine from Ace Hardware and it wasn't expensive ($20?)...came with like 8 or 9 sockets ranging from T10 to T60.
These trucks have them scattered from tailgate strikers to seat belts to seats to bed bolts to front axle straps, etc. There's even a set of EXTERNAL TORX holding your flywheel to the crankshaft.