Assuming you referring a "sedan" as a 4-door, all 4-door Darts were "post" cars, they weren't available as a hardtop like its larger brothers.
8500
HK Holden vehicles were manufactured between 1968 and 1971. Two varieties were available - sedans and wagons. Other lines of Holden vehicles were made as late as 1984.
According to the available information, Dodge produced approximately 96,100 Dodge Chargers in 1968. The 1968 Dodge Charger was a popular model and a classic muscle car from that era. It was the first year of the second-generation Charger, which featured a more aerodynamic "coke bottle" body style and a large chrome grille. The 1968 Dodge Charger had various engine options, including the legendary 426 Hemi V8. While the exact production numbers can vary slightly depending on the source, most estimates indicate that Dodge manufactured around 96,100 units of the 1968 Charger. This made it one of the more successful years for the Charger model, as Dodge continued to refine and improve the design in the following years.
Dodge
1968 Dodge Charger
Manufactured in 1968
The Dodge Charger had a new design in 1968. This 1968 Dodge Charger included hidden headlight grille, refined tail, less chrome and recessed backlight.
1968
The Dodge Dancing Party - 1955 1968-02-24 was released on: USA: 24 February 1968
1968 - 1988.
If, by ECU you mean "Engine Control Unit", I don't believe a 1968 dodge pickup had one.
1960 through 1968.