On my '07 pull the drawer most of the way out and on the center slide on the bottom of the drawer you'll see a tapered white plastic piece that rides in the metal support/slide. There are 2 little raised squares on this plastic part. Don't remember if its at those squares, before or after them that I pushed the sides together to get the drawers to come out. If that's the type you have I'll check mine out tomorrow and refresh my memory.
07 Octane 24z
06 F150 4x4 Supercrew, leveled, bilstein 5100, Firestone airbags
06 F250 4x4 ccsb 6.0L, 4" superlift with bilsteins