Aspen / U -3
Astro / V-1
Astro Cargo / V-3
Avalanche / T-3X
Caprice Station Wagon / S-3
Cavalier Station Wagon / S-1
Colorado / T-2
Colorado crew or ext cab / T-2X
El Camino / T-3
Equinox / U-2
Express Passenger Van / V-3 
Full SIze Van / V-2
Full Size Long Bed Pickup / T-4
Full Size Short Bed Pickup / T-3
Full Size Crew Cab Short Bed Pickup / T-3X
Full Size Crew Cab Long Bed Pickup / T-4X
2500 and 3500 Series / T-9 DBL check your trucks dimensions
2500 and 3500 Ext or Crew Cab, Dually / T-8
HHR / U-1 
K-5 Blazer / U-2
Lumina APV / V-2
LUV Pickup / T-2
Malibu Maxx / S-2
Malibu Wagon 1978 / S-2
S-10 Blazer / U-1
S-10 Pickup / T-2
Silverado 1500 extended or crew cab, short bed '03-'11 / T-4X
SSR / T-2
Suburban / U-3
Sprint / T-3
Tahoe 2-door / U-2
Tahoe 4-door / U-3
Tracker 2-door / U-0
Tracker 4-door / U-1
Trailblazer / U-2
Trailblazer Extended / U-3
Traverse / U -2
Venture / V-1
Uplander / V-1