Don't need to find any more caps. Turns out the Firestone cap is a perfect fit for Dad's '33 Franklin wheels. He was one short of the Franklin Olympic hubcaps (never find another of those either). The Firestone cap will ride the side-mounted spare. The car/truck is being ***embled from parts anyway, so this fits the theme. That story (with photos) is at http://www.jalopyjournal.com/forum/showthread.php?t=799746
This old ad might interest you with the illustration of those wheels. http://www.ebay.com/itm/1933-Pontia...265?pt=LH_DefaultDomain_0&hash=item3f16ace149