I'm dealing with very rusty rockers in a 70 K5. I just got a bunch of rocker parts from LMC and I am actually impressed with their quality (much heavier then stuff I got from JC Whitneys in the past). I am puzzled by the box under the floor, behind the rockers. It seems to be bolted on the trailing edge but welded at the firewall. There are two bolts on either end of the door opening that are covered by the rocker. I can't see any way to replace those bolts when I put in the new parts without removing the box. The more I look at it the more I wonder if I really need it. Its my understanding that the trucks didn't use them. Any ideas?