Well I pulled the rear carpet to get to the frame bushing bolts, and see that under the carpet, where was a fiber board with strips that were used to keep the carpet from forming to the ridges in the bed. I guess it probably deadened the sound some as well. Looks like it was originally silver, but the silver has all flaked off. Made a hughe mess. I have an 90 EB. Did all models have this? I have searched around and have seen no reference to this. Any idea if these can be purchased anywhere and if not, any idea what to replace that with? Looks like that pressed cardboard or fiber board got wet long time ago and fell apart.