Fits these cars:

GMC:

Apollo (73-75)
Camaro (67-74)
Chevelle (64-72),
Chevy II (64-68),
Corvair (65-69),
Monte Carlo (70-72),
Nova (69-74),
Omega (73-74),
Skylark (75-75),
Ventura (73-75),
Ventura II (71-72)

GMC Trk.:

El Camino (64-72),
G10 (67-71),
G1000 (64-66),
G1500 GMC (67-71),
G1500 GMC (67-71),
Sprint (71-72)