'87 to '96 F150s and '87-'97 F250 and F350 tailgates will fit. If you want a smooth tailgate, don't get one with the wide aluminum panel across the back. When you take that off, there are several holes in the tailgate.
the 87 and newer uses cables.
like was mentioned, look for a solid panel gate. the XLT lariat gate has an aluminum panel on the back. the plastic center falls out and if you try to eliminate it you end up with 4-5 holes in the tailgate.