Part Notes: All Models; 1/2 TON; Left; With Crew Cab; Hydro Boost System; 6, 400 Gvwr;All Models; 1/2 TON; Left; With Crew Cab; Vacuum Boost System; 7, 200 Gvwr;All Models; 1/2 TON; Left; Without Crew Cab; Hydro Boost System; 6, 400 Gvwr;All Models; 1/2 TON; Left; Without Crew Cab; Vacuum Boost System; 7, 200 Gvwr