Need help figuring this out. Body plate?

[AKlowriderZ71]

We just started cleaning out our recently purchased '67 Camaro to get at the floor pans. I found this plate laying in the car with the rest of the trash & misc car parts. I'm pretty sure that it doesn't belong to our car, it has one on the firewall already.

It reads:

ST 73 1XY17 214231 BDY
TR 754 A51 51 51 PNT
05A X 040464
GENERAL MOTORS CORPORATION
CERTIFIES TO THE DEALER THAT THIS VEHICLE
CONFORMS TO ALL US FEDERAL MOTOR VEHICLE SAFETY
STANDARDS APPLICABLE AT THE TIME OF MANUFACTURE

Pic--
https://static1.pt-content.com/images/pt/2011/05/136-2.jpg

[AKlowriderZ71]

Figured it out on my own, Google is my friend. It's from a '73 Nova hatchback V8, light yellow paint, and black perforated vinyl bucket seats. Also decoded the plate on our Camaro while I was at it. This is one of the websited I used http://www.camaros.org/numbers.shtml#InteriorColors