I kept reading all the suggestions found in this forum last night and just had to go tackle the task at hand. By midnight, I concluded that the riser brackets were necessary with the 285/75R16 Nitto Terra Grappler on a 16x9 Helo 878 wheel. Without them, this particular tire setup did not clear the OEM bumper, even with the slightly higher body space created by the polyurethane body mounts. 1st thing on the agenda today will be Harbor Freight for 3 rubber mallets. You guys are truly the BEST!!!!