That tank should fit the following vehicles according to RockAuto
Spectra Premium CR11C
DODGE DART (1968 - 1970)
DODGE DART 270 1968
DODGE DART CUSTOM (1969 - 1970)
DODGE DART GT (1968 - 1969)
DODGE DART GTS (1968 - 1969)
DODGE DART SWINGER (1969 - 1970)
PLYMOUTH BARRACUDA (1968 - 1969)
PLYMOUTH VALIANT 1970
PLYMOUTH VALIANT 100 (1968 - 1969)
PLYMOUTH VALIANT SIGNET (1968 - 1969)
The one you want is a Spectra Premium CR11E and it fits these vehicles
DODGE DART (1971 - 1976)
DODGE DART CUSTOM (1971 - 1975)
DODGE DART DEMON (1971 - 1972)
DODGE DART DEMON 340 (1971 - 1972)
DODGE DART SPECIAL (1971 - 1976)
DODGE DART SPECIAL EDITION (1974 - 1975)
DODGE DART SPORT (1973 - 1975)
DODGE DART SPORT 340 1973
DODGE DART SPORT 360 (1974 - 1975)
DODGE DART SWINGER (1971 - 1976)
PLYMOUTH DUSTER (1971 - 1976)
PLYMOUTH DUSTER 340 (1971 - 1973)
PLYMOUTH DUSTER 360 (1974 - 1975)
PLYMOUTH DUSTER CUSTOM 1975
PLYMOUTH SCAMP (1971 - 1976)
PLYMOUTH SCAMP SPECIAL 1976
PLYMOUTH VALIANT (1971 - 1976)
PLYMOUTH VALIANT BROUGHAM (1974 - 1975)
PLYMOUTH VALIANT CUSTOM 1975