I swear I saw these on a bike parts website recently, and just now I've hit all of the sites I've bookmarked, but not finding, perhaps the sites' Search engines are not catching them.
These thingies?
Cobalto
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Larry:1958 Drysdale, 1961 Gitane Gran Sport, 1974 Zeus track, 1988 Masi Gran Corsa, 1974 Falcon, 1980 Palo Alto, 1973 Raleigh Gran Sport, 1974 Legnano. Susan: 1976 Windsor Profesional.