I found another missing car from episode Never Send A Boy King To Do A Man's Job:

1978 Pontiac Firebird Trans Am Kammback Ep. 5.20

I also found some more missing cars from the first season:
1973 AMC Gremlin Ep. 1.02
1968 Cadillac Sedan DeVille Ep. 1.03
1975 Cadillac Fleetwood Brougham Ep. 1.04
1974 Chevroelt Caprice Ep. 1.01
1970 Chevrolet Chevelle Ep. 1.03
1972 Chevrolet Cheyenne Ep. 1.02
1970 Chevrolet El Camino Ep. 1.03
1974 Chevrolet Impala Ep. 1.01
1974 Chevrolet Impala Ep. 1.04
1974 Chevrolet Vega Ep. 1.02
1974 Dodge Coronet Ep. 1.03
1975 Dodge Coronet Ep. 1.21
1958 Ford F-100 Ep. 1.01
1972 Ford Galaxie 500 Ep. 1.03
1967 Ford Mustang Ep. 1.04
1973 Ford Thunderbird Ep. 1.03
1974 GMC Sierra Classic Ep. 1.04
1974 Honda Civic Ep. 1.04
1974 Jaguar XKE [Typ 1] Ep. 1.02
1963 Lincoln Continental Ep. 1.03
1971 Lincoln Continental Ep. 1.03
1974 Mack Cruiseliner Ep. 1.02
1970 Mercedes-Benz 250 C [W114] Ep. 1.03
1974 Mercedes-Benz 450 SL [R107] Ep. 1.01
1974 Mercedes-Benz 450 SL [R107] Ep. 1.03
1974 Mercedes-Benz 450 SL [R107] Ep. 1.04
1964 Mercury Comet Villager Ep. 1.04
1974 Volkswagen Karmen Ghia Ep. 1.04
1974 Pontiac Ventura Ep. 1.01
1974 Porsche 911 Turbo Ep. 1.03
1974 Triumph TR7 Ep. 1.02

Actually there are 49 pages for this Series and only 6 pics submited. I think it's useless add 31 new blanks fot this Series even more when you get the whole seasons.

See my comment http://forum.imcdb.org/forum_topic-5664-36582-Rockford_Files__1974_1980__TV_Series.html#p36582