17 inch.... I "Think" the part number on the 7 blade fan was... 2463-657 but since I never had to replace it, I have no ticket on it to be 100% sure... The original fluid drive was 2536-675 because I had to replace that several times... but now pleased I have the new "Heavy duty" Hayden 2947 as I was on my last NOS Mopar unit... being Mopar's shortest, but not short enough for the thicker core Aluminum Radiator. Wish I could have helped you more moparlee, as I would like to have you as a "friend"⚓