Add on to Hemikiller, the first number is NOT the year, like so many part numbers. It is more of a tracking/QC type number, so if they had a bad lot, etc., the parts can be found and dispositioned, etc. You will see the same type numbers on intakes, etc, only it is a year month day arrangement.
Now, if you want to get fancy, seeing how you have a 8 12 (August 12) how does that compare with the build date of your car. Most cars that have original fenders, that I have seen, the stamping date is only a few days before the build date, and the stampings are normally pretty close together, like a car with a build date of August 22 might have a 8 12 2D and a 8 13 1D fenders. Compare these stamps to some of the stamped parts that normally don't get changed, like the rear fender aprons, etc.