Mike,(posted 8364 days ago)Looking at my book 'GTO Recognition Guide' by Paul Zazarine (Dobbs Publications Inc. ISBN # 0-941596-20-2), the '72 model (of which I also own one, so congrats BTW!) should have a VIN that starts with either a '2D27' (for a Coupe) or '2D37' (for a Hardtop Coupe). The difference is that the coupe has the exposed windshield wipers and a post at the leading edge of the rear 1/4 glass (hence the name 'post-car' given by many GTO/A-body aficiniados). For '72, the post-cars are quite rare with apparently only 134 cars built in total. The hardtop coupe (or non-post) with the hidden wipers and the chrome edged rear 1/4 glass has a total production run of 5,673 (for a grand total of 5,807 cars for '72).
And yes, the other post was correct. For 1972, the GTO was an option on the Lemans (1971 was the last year for the GTO to be a distinct model). Another interesting tidbit from the aforementioned book was that apparently in 1972, GM was to change body styles (presumably to a body similar to what ended up being the 1973 GTO). However a strike at GM late in 1972 meant they did not have enough time to retool for the 1972 model year, so the body style was carried forward (albeit a few cosmetic changes) from 1971.
Grab the book, it has some great info.
Cheers, Brian '72 GTO.