Cabs are the same, 1/2 ton through 2 ton, exept for the LCF trucks.
Pretty much every aftermarket turn signal I've ever seen that used the "lollipop" style tights (instead of converting the factory parking lamps) mounted to the tops of the fenders. If the holes on you truck were just filled with body filler, you'll want to remove the filler and weld the holes up. Bondo doesn't do well filling holes, as it wasn't designed for that purpose.
