Well, I just couldn't let it go. I decided to search salvage yards. I found on the internet a site that polled 300+ yards for a part and it only cost $6. So, I put in a search for "the clear plastic Shield that covers the instrument panel".
I got two responses. One saying that it was unavailable as a separate piece. The other said that they had a perfect condition Instrument Cluster for a 2006 Cadillac XLR for $350. I debated for a day. Then decided to do it!! I had it sent to my home and asked Lewes Auto Mall if they would install it even though they're only a Chevy dealer. They said they would.
I'm so pleased. It looks great! Even though nobody would notice. I DO!