Part Notes: All Models; 1/2 Ton; Left; W/Crew Cab; Hydro Boost System; 6, 400 Gvwr;All Models; 1/2 Ton; Left; W/Crew Cab; Vacuum Boost System; 7, 200 Gvwr;All Models; 1/2 Ton; Left; W/O Crew Cab; Hydro Boost System; 6, 400 Gvwr;All Models; 1/2 Ton; Left; W/O Crew Cab; Vacuum Boost System; 7, 200 Gvwr