Fellow FGF member 'Gasgacinch' has been kind enough to inform me that the rims on my 67 FB 400 might be 'American Racing MAGNESIUM rims' similar to those shown here: Vintage Magnesium rims on Ebay

Keep this in mind when considering my $3K asking price. Prospective buyers are welcome test to the rims for magnesium if they wish. I've read that if you take a swab of white vinegar onto the rim it will bubble and form hydrogen gas if it's magnesium.