You could always have the indented portion stitched into the panels you have. I see them listed on Ebay quite frequently.
A quick search shows one listed right now: item 4613762672
I don't think you can mount the chrome pieces directly to a camaro panel as the indented portion of the birds is actually flat compared to the curved surface of a camaro quarter.
68' Firebird 400 convertible, numbers matching, solar red w/ deluxe parchment interior. 66' Pontiac Ventura Hardtop 66' Pontiac Catalina Convertible