Dodge trucks didn't get marker lights until 1970 as standard equipment. Prior to 1970 reflectors were standard on all 1969 and late 1968 as a government mandate. Although, there is some debate as to whether or not all 68's or only late 68's had them.
Dodge Truck Reflectors
Mark D.
1968 W200 Sweptline
1969 D100 Utiline
1971 D100 SE Sweptline
1993 D250 Club Cab Sweptline
1986 W250 Cab & Chassis
1978 D300 Sweptline
E. Brookfield, Massachusetts