For 1989-2002 5.9L Cummins 12v/24v applications up to 700 hp / 1,250 ft-lbs torque, Fluidampr recommends damper installation with the High Strength Bolt Kit for secure mounting. Kit features heat treated, high strength bolts from ARP? and a diamond impregnated friction washer. Harmonic Balancer - Fluidampr - Installation Kit - 1989-2002 5.9L Cummins 12v/24v - Up to 700hp/1250tq -under head length 1.425* -thread 12mm x 1.25 -head size 9/16* 12pt (14mm) 1989-2002 Dodge 5.9L 12v/24v Cummins. Up to 700hp / 1250ft-lbs torque.