My daily commuter has Soma HWY1 drops on it, I think they’re 42cm wide.
I’m I also have a Nitto For Shred riser that’s 65cm - pretty dang wide. I had it on a 1x8 but I sold that bike and kept the bars. Going to put them on whatever my next SS/FG/track frame is.
I also have Soma Late Riser bar on my vintage Raleigh - but that’s not a SS. Great simple average bar though. They are 54cm wide and would be great for a SS/FG.