Part Notes: 6.8L & 7.3L, Dual Alternator, Primary;6.8L & 7.3L, Single Alternator, 250 AMP;F350 Super Duty; 6.8L; With Dual Alternators; Primary; Extra Heavy Duty;F350 Super Duty; 6.8L; With Dual Alternators; Primary; Standard;F350 Super Duty; 6.8L; Without Dual Alternators; Extra, Extra Heavy Duty;F350 Super Duty; 7.3L; With Dual Alternators; Primary; Extra Heavy Duty;F350 Super Duty; 7.3L; With Dual Alternators; Primary; Standard;F350 Super Duty; 7.3L; Without Dual Alternators; Extra, Extra Heavy Duty