Her is what I found hope it helps
Searched 1408 records for part number/casting number "2663 52814552 30503" and yielded 4 hits:
2 2663475 - Right vent wing w/strip 67-71 Valiant 67-71 Dart 95LR
2 2663473 - Left vent wing w/strip 67-71 Valiant 67-71 Dart 95LR
2 2663435 - Left front door window front mldg. 67-76 Valiant 67-76 Dart 32LR
2 2663434 - Right front door window front mldg. 67-76 Valiant 67-76 Dart 32LR