Historical clue formulations

• Chargers and Challengers — 2026-05-07
• Mustangs and Firebirds — 2024-10-06
• G.T.O.s, e.g. — 2007-05-15
• Barracuda and others, once — 2005-04-22
• Mustangs, e.g. — 2003-08-15