Saki-
That piece in pic 1 is the CF rear window spoiler. This is the exact part that I had fly off my car last week lol (even though I wasn’t lol’ing at the time).This is honestly a BEAUTIFUL PART and is VERY subtle on the car. Looks great in combo with a rear CF diffuser near the exhaust. Sits flush and is solid made.
I know this won’t help 65vetteC6 but you can pick up this part brand spanking new for $180 to your door