Thanks for yes question. The reason I need to know what type of grille you have is so I can send you the right mounting hardware. The BAB comes with all stainless steel hardware and a nice, neoprene foam pad on the back. One aero/honeycomb grilles, no matter if it's R50/R52/R53/R55/R56 or R57 the mounting hardware is the same with 1-inch threaded rods. This is also tru for the slat grilles on the R50-R53. Where this changes is on the slat grilles on the R55/R56 and R57. The angle of those grilles requires 2-inch threaded rods for mouting. Also, those grilles have a black plastic backing between the slats which has some holes but needs a little drilling or Dremeling to open up the existing holes or make new ones to receive the threaded rods for mounting.