Fan Blade: 19.5" 7 blade w/ Large Hole hub ('71-'79) This is inside the cap

This is inside the cap of many of the various steering wheel horn caps GM brought out from around 77 on

commonly used self thread tapping speed nuts

69-70 Oldsmobile

This is EACH

Fan Blade: 19.5" 7 blade <b>w/ Large </b>Hole hub</> ('71-'79) This is inside the capMainly used on bigger V8 HD GM vehicles and commercials in the 70's. Typical more common use in 72 78 El Camino, Chevelle, Monte, GM c10 C30 heavy duty along with many motor homes and GMs.. really gotta match what your got.. IF.. IF what you have was really original. 4 bolt, large center 2. 5 inch.. thats about 64mm 19. 5 inch OD. which is a migen under 50cm. Be carefull with the OD as many fans also only take up to 19" or less.. fitting a 19. 5"