I have B Bramptons on an A single. It came to me with a spacer under the headstock top nut. This meant that the distance between the rear link pivots was shortened in relation to the length between links on the fork. As far as I could see this made the wheelbase extend excessively as the fork spring was compressed. I changed this to put the spacer below the bottom head bearing, restoring the angle between the links.
B Bramptons have bushes on the spindles and use 7/8”handlebars, both changes which appear to be improvemens.