Aftermarket ones have been around for awhile. Haven’t tried them, but have heard they sometimes will not program.
2005 M6 GTO
CGM | CCW SP550 | Pedders Xa | Kooks | Spintech | Ed Curtis Cam | FAST 92 | Duspeed | GMM | Street Slayer Clutch | Billet Prototypes | JHP Pod, Spoiler, Steering Wheel | GTOG8TA SAP Grilles | Cold Case
2004 M6 GTO
IBM | 05-06 Hood | Holden VZ 18's | Pedders | Lovells | 05-06 Calipers | Kooks | Spintech | Svede | Billet Prototypes | HSV Steering Wheel | WCS SAP Grilles | Mavman Spoiler | VX Tails | Mishimoto | Leatherseats Interior