Post 11 of this thread lists 67 interior paint codes. It was the 2nd thread result listed when I googled 67 interior color - on this site. You have to click the 67-72 radio button to search only on here.
http://67-72chevytrucks.com/vboard/s...d.php?t=643268
Silver Fawn Poly = Ditzler 22858, but keep in mind that you have to cross reference exterior paint code to make sure that is correct for your exterior/interior combo.