I will be using the hayden 2765 and have studied it some it's a 1989 + or - SJ6 Jaguar part and it's what's considered a standard duty clutch The Jag used a plastic fan 1989 JAGUAR XJ6 3.6L L6 Radiator Fan Blade | RockAuto which is 18 1/2 diameter and I'm considering using one concerned about weight and pitch of the Mopar blade not really suited for a standard clutch IMO 1989 JAGUAR XJ6 3.6L L6 Radiator Fan Clutch | RockAuto