Here are outlines of the eye on several of the Gransfors replacement handles. GB does not use standard eye sizing so commonly not a good fit for most other heads. But check and see if you are lucky.
#1 Amercian Felling Axe
#2 Double bit axe
#3 Splitting axes ans maul
#4 Small forest axe, Scandinvain forest axe, and several of the woodworking pieces, broad axe etc.