It is highly possible that if the differential fork side has failed, other parts have been damaged as well. The damaged differential fork requires replacement of the bushing and oil seal too.
Carraro has prepared an economical kit of original parts for its users with years of experience. This set contains the fork, bushing and oil seal.
The damaged Wheel side fork requires replacement of the washers and elastic ring too. It is necessary to change the Wheel hub o-ring to be sure the seal is working.
Carraro offers all these necessary parts such as washers, elastic rings, shaft and o-ring in one box as you can see below: