Fits CPL# 1000, 1083, 1091, 1095, 8344, 8345, 8346, 8347, 8348, 8349; Federal Emissions; Underground Calibration; Mega Cab; 6-Speed Manual Trans.; HD 2WD or CPL# 1000, 1083, 1091, 1095, 8344, 8345, 8346, 8347, 8348, 8349; Federal Emissions; Underground Calibration; Mega Cab; 6-Speed Manual Trans.; HD 4WD or 8350, 8351, 8421, 8422, 8423, 8424; Export Emissions; Mega Cab; 4-Spd. Automatic 48RE Trans.; HD 2WD or 8350, 8351, 8421, 8422, 8423, 8424; Export Emissions; Sedan/Quad Cab Short Wheelbase; 4-Spd. Automatic 48RE Trans.; HD 2WD or CPL# 1000, 1083, 1091, 1095, 8344, 8345, 8346, 8347, 8348, 8349; Federal Emissions; Underground Calibration; Sedan/Quad Cab Short Wheelbase; 6-Speed Manual Trans.; HD 4WD or CPL# 1000, 1083, 1091, 1095, 8344, 8345, 8346, 8347, 8348, 8349; Federal Emissions; Underground Calibration; Sedan/Quad Cab Short Wheelbase; 6-Speed Manual Trans.; HD 2WD or CPL# 1000, 1083, 1091, 1095, 8344, 8345, 8346, 8347, 8348, 8349; Federal Emissions; Underground Calibration; HardTop/Quad Cab; Long Wheelbase; 6-Speed Manual Trans.; HD 4WD or CPL# 1000, 1083, 1091, 1095, 8344, 8345, 8346, 8347, 8348, 8349; Federal Emissions; Underground Calibration; HardTop/Quad Cab; Long Wheelbase; 6-Speed Manual Trans.; HD 2WD or 8350, 8351, 8421, 8422, 8423, 8424; Export Emissions; HardTop/Quad Cab; Long Wheelbase; 4-Spd. Automatic 48RE Trans.; HD 2WD or 8350, 8351, 8421, 8422, 8423, 8424; Export Emissions; Regular Cab; 8 Foot Bed; 4-Spd. Automatic 48RE Trans.; HD 2WD or CPL# 1000, 1083, 1091, 1095, 8344, 8345, 8346, 8347, 8348, 8349; Federal Emissions; Underground Calibration; Regular Cab; 8 Foot Bed; 6-Speed Manual Trans.; HD 4WD or CPL# 1000, 1083, 1091, 1095, 8344, 8345, 8346, 8347, 8348, 8349; Federal Emissions; Underground Calibration; Regular Cab; 8 Foot Bed; 6-Speed Manual Trans.; HD 2WD