[Grumpy old man]

The rubber compression nuts go in from the outside .just push them in the holes on the truck ,the spacers go over the mounting screws before being inserted into the rubber nuts . they provide support as you tighten the screws the rubber compression nuts expand behind the metal to hold it all in place yet remain isolated . this pic shows the mounting screw without the spacer in place . the spacers hold pressure on the rubber nuts while your screwing them in which helps the rubber compression nuts to expand behind the panel . Without them the rubber compression nuts won't tighten and just pull out of the holes . If you need more pics let me know .