You won't find these anywhere else...obscure part most people don't know about unless you worked for Ford at the time but during the early 2000's during the time of the Bullitt Mustang, The new Fords showed up at the dealership with these yellow valve stem caps on them and they were to be removed and swapped out during the Pre Delivery Inspecation(PDI) for black caps. This was how you could identify the new cars on the lot that had not been PDI'd. The great majority of these were thrown away but we had a friend who thought to save a few.
 
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