Wow. That's the riser for the in bed spare for short beds. Never seen one listed nos before that I can recall. Good find!
Scott
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Camano' 1986 F250 Supercab XLT Lariat 460/C6
'Chanute' 1980 F350 C&C 400/NP 435 - Gin Pole
But there ain't nothin' wrong with the radio