How about the stock B12 naked's brackets?
Since we never got the 1G B12N here in the US, I've never seen them in person, but they look a lot like the 2G naked's brackets, except the blinkers are hung on their own brackets. The naked SV1000 uses the same or very similar brackets.
1G naked:
2G naked:
The 3G is similar to the 2G, but has provisions for the little fairing they have around their clocks.
3G Naked:
If you're gonna go with aftermarket brackets, they need to fit 43mm fork tubes.