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2025 C8 Z06/7/E-Ray of the Year Finalist - Unmodified
I don't know if there's a size difference but they do both feel different. I personally prefer the standard seats but I'm pretty sure most people prefer the upgraded GT2 seats. Swing by to some local dealers and try them both out and maybe take some measurements if you'd like.
I have had 6 C8s and all have had the GT2 seats because they were either 3LT or 3LZ trim levels.
A buddy just picked up a 2LZ Z06 Coupe with the standard seats so I was curious. He is a big guy, as am I, and said his back fits much better in the standard seats and he didn't care about the carbon fiber insert because he is sitting in the seat and can't see it.
The seat frames are the same for the GT2 and the standard seats and are identical to the C7 seat. The GT2 seat cushion uses a higher density foam cushion than the base seat. The upper cushion is tighter between the shoulders in the GT2 seat.