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I went through three different sets before I found what I really wanted. I think the first was aspsis, the second was naked parts and the third was GM. The GM just looks like they should have been on the car from the factory. Very happy with them. But, I think your '427' is a GS so I'm not sure what you can get for it. The GMs on the standard body look great though.
GM makes a very nice set of front splash guards for the C6 that is high quality and very reasonably priced ... However, they only fit the narrow fendered C6.
If you have a wide fendered C6 (GS or Z06) .... these will not fit.
Your only option is the OVERPRICED front splash guards from Apsis.