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Hi Brett,
Oops - maybe you shouldn't pick them up! I wish I could help, but all my models are still in storage (we moved house recently, and haven't finished unpacking). I don't recognise the particular part, but maybe it is from the exhaust / transaxle area - there is nothing on top of the car that is silver. Check out these images - maybe they will help.
I can help with the decals. They are contained in a small plastic bag, taped to the underside of the wooden base that the model was screwed to.
Cheers, John