Looking at the 67 AIM, UPC 0 Sheet C1 Miscellaneous Shipping List, it shows just one part number 7792010 Booklet-Fldg Top Instr. Would they have been using older/other stock p/n 4228124 in the early cars, or that page of the AIM later revised? But the booklet indicates the 1967 model year, so you wouldn't think there would be any old stock to use up first. And I don't see anything indicated down in the bottom right revisions box.