All of the FI wheels I’ve ever seen have been riveted 15x6” as well. I have seen FI wheels with later date codes (picture is of a 1980 wheel). Yours might be 1977 dates, before they added the second digit in the 80s and 90s. 1967 doesn’t make a lot of sense for a 15x7 wheel-they weren’t released and there weren’t really tires wide enough to warrant them.
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