RE:, 1968 model year Mainly reffering to cab, doors, and fenders. Are the 400 and 500 cabs the same dimentions for interchange? Also, in general what are the basic differences to a D300? Gordo
300-800 cabs all identical.
100-800 doors, hoods, core support, grills all identical.
Only fenders are different, but all will bolt up to any cab, 100-800.