Here are some pics that show the differences in build dimensions on similar cars at THE EXACT SAME SPOT
As you can see this is the exact same point on 2 different cars but the spacer used is almost a 1/4 inch thick.
The location of the body bolt is different in both cars as well ( I don't have pics of that yet)
All Vipers when built are hand made and are pieced together and then at final assembly stage are shimmed and adjusted to make the panels fit. A lot of cars are not perfect when received from the factory and I have personally moved a stock hood from one car to another and found that what was a perfect fit on one needed adjustment on the other.
Aftermarket parts sometimes need adjustment to the surrounding panels as well for a perfect fit.
The Hood that Kelly has was a previously owned hood that the previous owner will attest to fitting perfectly on his red SRT10. The hood had a hand print visible in the gel coat so we replaced it and the replacement hood also fit great on his car.
Kelly "won" a fiberglass hood and needed it right away as he wanted to paint it before he went to the race that the hood had been donated as a prize for. I offered kelly this imperfect carbon fiber hood as a gesture of goodwill as he would be able to race with out painting and then could paint the hood later after the race. Kelly received the hood and made no complaints initially but has since shown his true nature and has criticised the product to no end.