The 1969 Chrysler Parts Catalog Jan. '71 printing
shows two "radiator grilles" (section 7-16-11):
2898242 correct for LP & LS
2898114 correct for LL & LH
* no listing is shown for LM (Swinger 340)

it also shows two headlamp bezels (section 8-34-40):
2898252/2898253 correct for LP & LS
2898144/2898145 correct for LL & LH
* no listing is shown for LM (Swinger 340)

HOLLANDER show two "grille screens":
2898242 correct for GT & GTS (LP & LS) with footnote "same as others but portions are painted dark gray"
2898114 correct for others (LL, LM & LH) pictured

HOLLANDER show two "headlamp doors":
2898252/2898253 correct for GT & GTS (LP & LS) with footnote "same as others but portions are painted dark gray"
2898144/2898145 correct for others (LL, LM & LH) pictured

per these two sources and the data book pictured above, they are all in agreement:
black grille is GT & GTS ONLY
bright aluminum grill is Swinger, Dart, Swinger 340 & Custom
vintage magazine ads/road tests agree & I've edited my above post