There is described an agricultural tractor having an implement hitch or linkage which is arranged to receive linkage balls of different types. The tractor is provided with at least one linkage ball holder which can be used to store unused linkage balls on the tractor. The linkage ball holder is at least partly formed from a resiliently deformable material, such that a linkage ball can easily be retained within the holder without the need for additional mechanical locking parts.
