I don't remember the name of the manufacturer of our mats but they have never fit the tunnel very well. As Don said, they don't have the rectangular pattern where your feet rest. If you ever have a water leak in the cowl area, you can kiss your floor pan goodbye. The water just lays under there until it eats out the floor. A friend had a Beaumont and the floor was gone in 3 years. Not good.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.