Grille finish varied by trim level. I believe that in '84, Ford used all of them - black, argent and chrome.
There are definitely quality differences by vendor. Carpenter is often Ford Authorized, watch the catalog. Not everything is, and you pay for the licensing, but those parts are perfect. I've had good luck with LMC, but they're the only other online vendor that I've used. Hopefully more will speak up and let all of us know what luck they've had with various vendors, both good and bad.
Ford Parts Monkey since 1985
1981 F100 Flareside - Black, 302-4V Roller/AOD
1986 F150 Flareside - Medium Fire Red 302/AOD
1989 F150 Standard Cab 4x4 - Dk Shadow Blue 302/AOD
1993 F350 4x4 Crew Cab - 7.3 IDI/ZF-5
I think it's a sickness...