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xB Leaving Pit Soon
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Following are part numbers for the four Thunder Cloud Metallic (Silver/Gray) rocker molding caps. They cost around $23 each.
75858-52010-B0 Left (Driver)
75857-52010-B0 Right (Passenger)
75864-52010-B0 Left (Driver)
75863-52010-B0 Right (Passenger)

Listed below are two Scion websites which currently list the caps and will facilitate purchase. Even so, as you have experienced, these may no longer be available. You may choose to call them prior to ordering. I have used both of these sites for several years and they have carried a good inventory of Scion parts.
Genuine OEM Toyota Parts and Accessories Online - Toyota Parts Deal
Toyota Online Parts | Genuine Toyota Parts | Toyota Parts Online

A pull-a-part salvage yard may be your best bet; one of the "Get it your own dang self" places.
Good luck with your search. Please post your results.
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