Looks like two official pony pillows.

• Photo Information:
• Convertible Top Color: white
• Interior Color: white and green
• Visible Options: official pony pillow
• VIN: 3F03H******
• Owner: from Illinois IL
• Posted: 07/12/2008
• Other Links
• It's in the 1973 Mustang Collection Pages
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• Explore 1973 Mustang data decoders, specifications, and options
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