Hi. Yes, as you've heard, they did have a post model. They are more desireable and as the others have posted, the first five #s of the VIN would be 24207. I have purchased a GTO numbers book that has been a great reference in looking for a GTO. It is caled "Catalog of Pontiac GTO ID numbers 1964-74. It will give you ALL the info regarding trim, motor #s, data plate #s, rear-end #s, etc. You can also look up PHS (Pontiac Historical Society) online and print out a form to send in or fax with the VIN# and they'll provide you with all the info on that vehicle including motor, tranny, trim#s and all the options that came with that car. It's proven to be very helpful in purchasing a GTO.
Hope this helps.