i am new to this so please bear with me. i recently bought a 67 "118" ss nova. 100% numbers matching and original down to the carpet and alternator. with protect-o-plate, manuals, documentation. when i got it home i wanted to see if i could find a build sheet. pulled the back off the front of the pass. seat and right there tucked behind the springs was a build sheet. ok. here is where it gets interesting. i pulled the back seat out and there was a second build sheet there, however it does not match the cars color. all dates are within days of each other. original owner swears the interior is the way it left the factory. i have heard of a strike that took place during the build date of my car and the assembly line workers would use what they had to complete a car. i am sorry that this is so lengthy. please, i need some help.