I was looking for some screws to narrow the front turn signals from the stateside size to euro standards, but apparently they are too new to be in stock.
Are those spacers just for the US?
You do not need any special bolts, they just need to be shorter, any DIY shop will sell them, I think they are 6mm.
Just take of the blinkers and you will be able to see how long it needs to be without the spacer. I did mine with a couple of bolts I had in my toolbox, I came over from London and it's always handy to have a few metric bolts around for the Duc.