I have an original on my desk now and just took photos of the original off our survivor 70...they both have the flat rivets.....it also appears if there is a slight recess (almost a coutersunk area) at each fan bolt hole. May just be from being bolted on the engine but it looks like it is machined into the part. Maybe I can swap a 5 blade fan for an 837 alternator...or 499 distributor....
wilma
