Over there, check out ebay.co.uk
Seller ID: lights4all in Germany has nice ones a few of us have used. I use their tail lights and smoke turn signals. Shipping from there probably is cheaper than from the US and faster.
Do a search for "GS500 (headlight,headlamp)" FYI: The items in parentheses is an OR condition. It comes out to GS500 headlight OR GS500 headlamp when doing the search.
I'm sure you'll find one over there. Half my parts come from Europe and about split between Germany and the UK with an occasional part from France or Spain.
If you decide you really want an OEM one from the USA, PM me back.