First, YOU WILL NOT FIND A SPID ON A PRE 84 CAR!!! 84 or 85 was the first year for a spid(service parts identification decal). As for buildsheets, you can find them anywhere. Every assembly had either a buildsheet or broadcast sheet(less info) to tell the workers what went into what cars, BUT it was considered trash and was supposed to be removed and thrown out. If they got sloppy, or someone knew to keep a few in the car, then you're lucky. My car had one in the passenger side door panel, above the headliner(the best of them all it's perfect), and under the carpet, which was entirely destroyed and not even paper anymore, but an imprint on the floor. I also have a broadcast sheet out of the rear seat cusion written in french(being my car was made in St. Therese, Quebec.)