Basically, I'm just cutting out the old mounts, then putting in new ones. I've cut out the plate for the new mounts, just need to tack them in and get the bigger welder out and get them on, then off to drill the holes....
Since the factory bumpers original mounts actually go through the bumper, I'm going to take the extra precaution of welding in gussets to strengthen the mounting surfaces, allowing for more contact overall.