I know that when I wanted to change my B2 KZ1300 to an A2, I needed to change out the handlebars. I ended up going with what turned out to be replacement bars for a CB750 Honda.
Dimensions: 31.5" wide, 4.5" rise, 7.25" pullback, 6" center width, 7/8" DIA.
I figured this out using a broom handle and sitting on the bike and holding the broom handle where I thought the bars should be and had a friend measure the spread and riise. Then went to a catalog and found similar width and rise. As far as the pullback, the CB750 has a similar ride style so I opted for the replacement bars for the CB750.
For giggles I measured the pullback on the B2 handlebars and they were 10" which is close to a Harley. No wonder I hated them.