50cm? that's pretty wide, you can trim off the end slighty to make it a bit less narrow, the other option are those french-style one that you can try and get for 42cm, like the Velo Orange/Nitto Montmartre bar.
the velo orange porteur (48cm wide) will be back in stock at freshtripe in february (i've asked them yesterday).
the velo orange porteur (48cm wide) will be back in stock at freshtripe in february (i've asked them yesterday).
http://www.velo-orange.com/vopoha.html