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Hi Alex, 59 experts have looked at your question. so have just been out to the shed and mearsured a set they are 29 inches tip to tip. see even a girl can do it. love jenny 
email (option): richardholt@rocketmail.com
The trouble is Jenny that we're not all BSA experts.
For what it's worth, the WD16H handlebar is 27 1/2"
I measured mine and they are 22 inches wide.
Of course they are seriously bent and straightened a few times.
I did buy a set of EMGO Superbike bars in black enamel finish, a scuff with a scouring pad and a coat of green paint and they should look pretty close to correct. I think they are about 29 inches wide
Nothing a hacksaw won't fix.
Vince
email (option): vinver#ns.sympaticodotca