K-codes had no unibody pieces that were different than non K-code cars. Maybe you can show us a picture of what you mean? As far as I know a K-code was just an engine package sharing the rest of performance package with A code GTs...as far as I am aware the only unibody difference between a GT and a base 6 cylinder car was dual exhaust reinforcement panels. There were plenty of engine, steering, and suspension differences of course.