Was the seller a ebay vendor or was it a private seller? US seller? Do you know if the vendor has more?
I've wanted these for my bike for a long time but they are really hard to get in the US. Every time I would travel to europe I'd see them on kawasakis. They are made in France and when they are on the bike they look totally OEM, which is cool. Also, since they have a large surface area they may crash better than typical mushroom or cylindrical sliders.
I have some pics of top block sliders on an '05 636 I saw in Barcelona buried on my computer somewhere. I'll see if I can dig it up. They look awesome on a green bike.