need some help with id'ing doors

[schurg]

basically, I'm in the market for a new (old) set of doors, and I was wondering if there any visual difference in a 67-71 door versus a 72? for instance this ad caught my ad:

http://richmond.craigslist.org/pts/3732393914.html

the second pic shows the interior side, this looks a bit different then my current doors (68) but I'm not sure if there is any other differences throughout the years.

thanks

and..if the ad poster is a member here, I'm potentially interested lol