Back of Wheel (REAR)
GRAY-GREEN DELSTAR DAR #2847 (1977 FORD Dove Gray)
Front of Wheel:
The PPG # for '67-'69 argent silver is 8568.
I don't think GM had a code for Argent Silver...There is no GM code for it in PPG books, it is listed by name as a accent/wheel color. The PPG # is 8568 for Argent Silver.
Another option I have not tried but have heard of is the silver/green 1983 Maserati Smoky Quartz Metallic BC/CC.
I would imagine if you have the Argent mixed you could have the jobber add some tint to achive a green hue if desired.
Hope some of this helps.
Jim