If the 300GPX Concept Car hasn't been crushed yet, I suppose the engine cover on it may still be ok. But, if it has been destroyed, I'd be willing to bet its engine cover was destroyed as well.
There is one of the 300GPX (Mule) engine covers still around though. It looks exactly like the engine cover you see all the pictures of on the Concept Car. Even down to the rub mark on the left hand side of the cover where it makes slight contact with the underside of the hood.
It just so happens that I own it. I won it at GPG 2000 during the auction. It's sittig in my garage and sometimes for various meets I'll take it down and mount it on my engine. It's very nice looking and a piece of Pontiac history.
Marc
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'00 Trans Am WS6 w/ 25K miles - Lovin' it!!
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RIP '99 GTP w/ 41K miles - Totaled in fire
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RIP '97 GTP w/ 192K miles - Totaled when broadsided