Won't open on a mac either. The site says minor drilling of two holes, not four if that helps. I the the front and belly but not the rear.
2006 GC Limited, 5.7L HEMI, Quad II. 4XGUARD Belly & Front (black powder coat) skid plates. Matrix front guard, PIAA Matrix mounted lights, 265/70 Nitto Trail Graplers MT, 1.5" Spider Trax spacers, Super Chips Tuner, OME MD Lift, 4XGUARD differential guard, JBA UCA'S.