Possible Clues:

• 1960's doo-wop group that was a one-hit wonder, with 'the'
• 1950s Citations, e.g.
• Lemons with motors
• Bombs with wheels
• Infamous Fords
• Collectors' items from 1958
• They had 'horse collar' grilles
• Old Ford flops
• 1960s doo-wop group with an automotive name, with 'the'
• Disasters discussed on the Blue Oval Forums