I came across this Atlanta based company on eBay. They sell new Italian production lenses for most Italian cars. This includes the Alfa 1750 BN that we commonly call Grp.4. Also listed are lenses for the Mangusta.
Their site also shows some new production rubber trim for:
Douville 1971-88
Guara
Longchamp 1973-88
Mangusta 1966-70
Pantera 1970-89
Vallelunga 1963-77
Below is their site link.
http://www.mrfiat.com/
I spoke to a guy named David who believe it or not, actually returned my call!
Jeff
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