Looking though my buildsheet collection, I noticed I have a buildsheet from the extended production period of the '80 run.
Possibly the Very last Spyder ever made?
The date was 10-15 so here's evidence that the line ran into October of 1980. It's vin was # 288113, so it was the 188,113th Monza built.
That's a few thousand more than the 169,418 that were built that year, as listed on Bryan's Production Figures page. http://monza.homestead.com/files/HBodyP ... bersWP.htm
This one was Light Blue with Blue interior and Stripe.3.8 / 4speed.