Just FYI, there are two different paint schemes and part numbers for 68 Dart front grilles and headlight buckets. One for GT/GTS. And a different one for the Dart 270, 170 models.
Not for sure about the special models like: Western Sports Special (yes in 68 ), White Hat Special, etc...
Hemi Darts got the GT/GTS type grille. But no GT/GTS finish panel. The Hemi Darts are strange combination of parts.
CORRECT for Hemi Dart and GT/GTS
Picture of car being picked up at Hurst:
Early picture of car after graphics painted on:
NOT CORRECT for Hemi Dart and GT/GTS
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From the
68 Dodge Dart Dealership Data Book