Possible Clues:

• A, O, T and U?
• Spark plugs, wipers, etc
• Junkyard inventory
• Spark plugs, headlights, etc
• Carburetors, for instance
• *Carquest stock
• Mechanic's stock
• Air filters and spark plugs
• Wheel and axle, e.g.
• Fenders, taillights, etc.