Thanks for the info...
Appreciate the information. I noticed this afternoon that the upper part of my rear exhaust pipe cover was loose enough to rattle against the retainer tab. The front pipe cover is snug. Haven't seen any loose parts recently.
Pending new pipes I thought I'd try to loosen the rear pipe cover band screw, remove the rear pipe cover, and then shim the retainer tab before reinstalling the cover. Finally I think I go ahead and place my order for new Cobra pipes.
Update: I ended up removing the exhaust system so I could seperate the retainer tab from the slot . I used a small piece of u-shaped rubber coated metal (from the material supplied with my vehicle bra) and wrapped it over the retainer tab before reinstalling the tab into the cover slot. With the system off the bike I was able to see a plastic/rubber cover on the retainer tab for the front pipe slot. Because the slot in the rear pipe cover is open on the downstream end, and my temporary gasket doesn't have a lip to allow the pipe cover to hold it in place on the retainer tab, my homemade tab cover will eventually slide off the retainer tab and drop free - just like the original. For now however, my rear pipe cover won't be making any more noise. Sorry no pictures.