Our stoker bars were molished from cheap bullhorns sold on e-bay for fixies. But given that they were far too narrow as delivered, some none too gentle action involving a bench vice and a long bar resulted in flaring them out to 50cm width at the ends, giving enough space for my, er, shall we say 'adequate' hindquarters. However, my most frequent stoker, Mrs653, found the forward lean excessive. At her request, they're now mounted facing backwards, omafiets style, so she can sit more or less upright, as the rear toptube isn't long at 58cm. Captain's bars are drops, and I ride mostly on the hoods so captain and stoker adopt very different upper body postures and I'll admit it does look a bit mis-proportioned in photos. I run On-one Midge bars on my audax bike.