Check out the dealership's other cars - they have lots of classics there, all priced highly as expected.

https://www.kijijiautos.ca/dealer/25544/

Never thought of my beast being a $23,500 car.....

.....in fact most people tell me these cars are worthless as collector vehicles. I always thought that $6,000 to $7,500 would buy a nice one and clearly the one for sale is in good condition. No sense nit picking on what is or isn't "correct",  for goodness sake look at what I've done to mine. 

As Todd points out the cars were little changed over the 73-77 run save external body work, as 73 is a one year only body, and reduction of availability of large displacement engines as the years marched along. There was the discontinued GTO option and a melding of the Grand Am with the Luxury Lemans to become the Grand LeMans.

Bob F wrote:

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Not sure there was a 1973 "GT"

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 You can be sure now.

As I mentioined no sense nit picking a 48 year old car, things happen over that many years. Its obviously been repainted and things have been left off and liberties taken.  I've seen documented 73 GT's with that stripe too by the way.