Two rear 66 GTO seats were sectioned and became two Tempest bench seats , I had seen the pleated patterns in some Tempest ( possibly custom option ) . The door panel inserts from the GTO were also cut out and transferred to the Malibu door framing . The GTO dash will be a challenge , but it matches the Tempest layout minus some gauges . Notice the GTO grill has been hogged out and replaced with a Tempest / Lemans photo-etched grill. The MSG photo etch set also includes the Tempest and OHC-6 emblems . I will also attempt to make headers for the OHC 6 engine .