The 2 piece badge would be from before the DeTomaso era and be metal. Here are a couple but they are a bit larger than your requested size
http://www.ebay.fr/itm/GHIA-ch...0:g:LjQAAOSwxu5ZHWSZ
http://www.ebay.fr/itm/FIAT-23...7:g:dzYAAOSwnHZYiakQ
http://www.ebay.com/itm/Fiat-G...AOSwRLZUDe2p&vxp=mtr
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