Stole this from a blog but thought that the price is right and it narrower for the guys that do the road king bar rear turn signal relocation on their dynas

 

That one uses the flat style turn signal housing, too big imao.
You need this lightbar from Streetglide 68629-05 reuse stock Dyna turn signal bulbs and sockets. That's what I did!

 

That's the point. The black one is smaller than the stock one.