I used Totally Auto's argent on my 70 grille and it really turned out well. I'm pretty sure it was their standard "dark argent" but I would have to check the can to say 100%. I don't have a good closeup pic here are work but there is a really nice one in the July edition of Mopar Muscle

"Who is John Galt?"

68 Coronet RT LL1 Auto
70 Duster 340 (yea right) FE5 4 SPD, 11.86 @ 114 MPH so far
01 2500 Quad Cab 4x4 Cummins