100.01 In. Heavy Duty Serpentine Belt for Ford F-250/F-350/F-450/F550 Super Duty. Item Type: Heavy Duty Serpentine Belt. Feature: Heavy duty belt provides longer life compared to standard belt. • 1999-2001 Ford F-250 Super Duty V10 6.8L - GAS; with A.C.; w/o Stripped Chassis.