Wayne, I tried to warn people about that fan as you can read above, there is no "book" evidence showing the correct fan for correct time period etc. I can tell you that according to the "experts" out there, there has never been a BB Nova fan that didn't have 5 rivets and straight cut fan blades. check
www.novaresource.com. Greg Roberts has culled all the information from every expert from every corner of the country and mostly from original 68,69 and 70 untouched survivor cars. How does Jenny know there were 3 different versions of this fan?, no such info available imo. Simple popular opinion says there was the 68 only fan and then the 69-70 fan with two bolt patterns, all fans having 5 rivets and straight cut blades. Seems kind of petty, but when your spending $650 bucks on a radiator fan, you want the right piece. Just my 2 cents SULLY