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The tailgate background on 67-69 was painted in what was called "non smudge aluminum" GM code 575 and PPG code number 8568 available now only in their OMNI Basecoat line of automotive paints, in can be cross linked to Dupont's automotive paint line as well. Around 1970 the aluminum color was replaced with the Chivy trucks, obviously a production line cost saver as all GMC light duty trucks were coming out of the same assembly plants as Chevrolet trucks and certain models like the Jimmy and Suburban and possibly trucks with rear coil spring suspension were coming off Chevrolet Truck assembly lines.