PETERBILT CONVENTIONAL SERIES 1975 (1) (RSS) 1976 (1) (RSS) 1977 (1) (RSS) 1978 (3) (RSS) 1979 (2) (RSS) 1980 (1) (RSS) 1981 (1) (RSS) 1983 (1) (RSS) 1984 (1) (RSS) 1985 (1) (RSS) 1986 (1) (RSS) 1987 (1) (RSS) 1988 (1) (RSS) 1989 (1) (RSS)