I understood them to be a dealer option in Japan...possibly other markets. So they could have been installed by the dealer on a Cosmo.
I don't think they were ever offered by North American dealers. One of my favorite wheels for the FD...a little "old school" maybe but so am I. And your right, the cap is odd, and good luck finding a spare if you loose one.
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Jim
VR R1 FD
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