NANKET,
I have two sets of wheels, one from a 67 Belvedere I wagon, another from a 67 Hemi GTX. None of them have the nubs as in your photos. I had not previously seen any examples with the nubs on any 67 B-body so your pics got me curious and I did some further digging. I contacted a friend with several original cars, he claims that some have the nubs, and some don't, he's going to get me some pics that I can post so we can hopefully get to the bottom of this. I can only assume that there were multiple vendors or variables between plants. All of my originals have been either St.Louis, or Los Angeles plant cars and none of mine are KH wheels (which is why I asked several times on this thread about the vendor markings). Also, the early examples I have (November 1966 SPD, St. Louis) have no date codes, the later set I have (April 1967 SPD Los Angeles) have date code stampings.