The US spec are solid amber. We have just one bulb with twin filaments, one lights for parking and the other for turning.
Euro has a clear section, but my question is whether there are different bulbs for each section that light separately.
I'm also thinking the US ones are more square while the euro ones seem longer, more rectangular, but I could be mistaken about that.
US spec:
Also, an ebay auction showing them removed:
http://www.ebay.com/itm/1982-lancia-beta-spider-turn-signals-/301354576013?pt=LH_DefaultDomain_0&hash=item462a21e88d