Interesting, might be another research topic to narrow down the date, and figure out why this may have happened. One thing I noticed on my unrestored car is a grease pen type date on the under side of the left wing, it says "6-24 D" . Not sure if you saw anything on the underside of this wing that would be similar. I will have to get at the right angle , and see if I can figure out which spoiler I have on my 08C car.