You might try German eBay. That is where I sourced my Euro lights.

http://cgi.ebay.de/Mercedes-W123-Scheinwerfer-rechts_W0QQitemZ160389057432QQcmdZViewItemQQptZAutoteile_Zubeh%C3%B6r?hash=item2557eecb98

http://cgi.ebay.de/Scheinwerfer-Mercedes-W123-links-Neuw_W0QQitemZ260527844398QQcmdZViewItemQQptZAutoteile_Zubeh%C3%B6r?hash=item3ca8ab6c2e


Lenses alone are available too:

http://cgi.ebay.de/Hella-Streuscheibe-f-Scheinwerfer-links-Mercedes-W123_W0QQitemZ390128942216QQcmdZViewItemQQptZAutoteile_Zubeh%C3%B6r?hash=item5ad57f3c88