I just checked the stash- - - - -mine is a 1959 3 speed Muncie, not a B-W. I'm not sure if the synchros will interchange, but it's doubtful. Give Todd's Auto Parts a try- - - -they have a habit of pulling a rabbit out of the hat pretty regularly. Back when Gardener's Auto Parts was in business, I'm sure they would have that stuff, but they went out of business about 10 years ago when the owner died.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!